Mighton Products

  • Introduction to Sash Weights

    Steel Sash Weights

    Designed to replicate traditional cast iron weights, our Steel weights come with a hole in the top for the sash cord to pass through and a larger hole in the side to accommodate the knot. As square steel weights are more dense than their round Cast Iron counterparts you steel web 2can squeeze more weight into your window box allowing you to compensate for heavier sashes.

    We stock Steel weights in 1lb increments across 3 section sizes from 6lb to 40lb, allowing you to select the weights you need without having to cut them down.

    We have been selling Steel weights for over 25 years and are confident that they can be used in 95% of all new and refurbishment projects. If you are unsure, ring us for advice.

    All of sizes are in stock and can be delivered overnight.

    Lead Sash Weights

    25 years ago Mighton Products developed the format that lead weights are manufactured in today. Namely, in 600mm lengths and 6 section sizes.

    As Lead is significantly more expensive (but dense) than Steel or Cast Iron, we recommend that Lead weights should only be used when Steel or Cast Iron weights won’t work for you. This can happen if, for example you need to increase the weight in the sash boxes to counter-balance thicker glass or double glazed units.

    lead weights blog



    It can also happen when the size of the brick reveal has limited the size of the sash weight box.

  • Sash Springs Calculator by Mighton Products

    calculatorCalculators for Springs from Mighton

    If you know the size of you require then please use the links below to select the ones you need. Otherwise please use our Spiral Balance Order Form that will select the correct sash springs for your requirements.

    Standard Sash Spring 10 - 40 lbs
    Available in two weight bands:

    Sash springs are stocked in 1" increments from 8" to 51"

    Mighton products will calculate the length of the sash springs required for each sash from data given by the customer on our Spiral Balance Order Form.

    Whilst we can calculate the weight of glazed sashes automatically, the customer should note that this is at their own risk and it is more prudent to give accurate glazed weights at the time of ordering.

    Standard Colour - White | Brown PVC covers available.

    Standard Sash Springs 

  • Ventlock For PVCu Fitting Instructions

    Mighton's Ventlock helps secure sashes and sales

    Ventlock is quick and simple to install:

    • Drill holeIcons for pvcu ventlock
    • Insert Ventlock
    • Drill rivet holes
    • POP rivet Ventlock to the sash
    • Conceal rivets with self adhesive trims

    As with all of Mighton's products, Ventlock is being tested to all relevant standards for window hardware. Enabling PVC-U sash window fabricators and installers to offer their customers the peace of mind that comes with fully tested security products.

    Why not Check out Angel? - Click Here

  • How to Remove a Double Hung Sash Window

    Double hung sash windows are common in older properties and most installers will come across them. Whether in a renovation project or wholesale window replacement, removing them safely, with the least possible impact to the window and its frame is crucial. The correct approach can save a lot of time and effort making good unnecessary damage.

    Step one - Remove staff bead
    Working from the inside, start by removing the outer staff bead. Usually nailed into place and coated with many layers of old paint, the staff bead stops the bottom sash swinging from its vertical position. Resist the temptation to use a chisel to break the seal. Instead take a wooden block, line it up with the join, and tap gently but firmly until the paint breaks. Doing this along the whole length of the bead should mean it's reusable.

    Step two - Remove bottom sash
    Now the bottom sash can be moved out from the frame, enabling access to the cord. To remove the bottom sash completely, the cord that carries the sash needs to be detached. Various ways of attaching the cord to the sash are in use; Mighton's Grabba is increasingly common. Because, in most cases, using the Grabba cords don't have to be pinned into place with a hammer and nails - an all too common cause of broken windows. If a Grabba is in use, simply pull the cord down and out of the teeth and unthread it, keeping hold of the cord at all times. If pinned, pull the cord away from the frame with a gentle, constant pressure until the cord becomes free of the frame.

    It's especially important to keep hold of the cord if your plan is to reuse it, as letting go will see the cord, pulled by the sash weights, disappear into the weight cavity. Time spent delving around inside the cavity, trying to find the cord is avoidable by tying a knot big enough to prevent it passing over the sash pulley. Repeat the process on the other side of the bottom sash window and set the window safely to one side.

    Step three
    The first two steps apply when removing the top sash window too, only this time instead of a staff bead, you need to remove a parting bead before taking the top sash out. Parting beads keep the top and bottom sashes apart and sit in a groove running the length of the pulley stile. You may need to use a little more force than with the staff bead, but as before, use gentle persuasion not brute force to limit damage to the frame.

    Step four
    Now move the remaining top sash away from the frame and repeat step two, taking care not to lose the sash cords into the weight cavity. When complete, full access to the frame is available.

    Not rocket science
    Taking care how you remove a sash window saves time and money. Although not hard when you know how, the effects of a poorly renovated or replaced window will have a long lasting effect on the operation of the window, and it means costly callbacks.

    Want more information or advice? Email us at sales@mighton.co.uk.

  • How to Correctly Balance a Double Hung Sash Window

    At its most basic, a window should be able to do two things: open to let air in and close to keep out the elements. A surprising number of homeowners live with stiff, rattling sash windows, or even ones that don't open. The usual suspects behind this problem are the weights. Getting them right is the first step to a smoothly sliding window. Here's how to get the balance right, saving you time, money and hassle.

    Remove the sash windows and then continue with the steps below.

    Step one - Remove the weights

    The weights operate in channels inside the frame - the top sash weight channel is the outer one. To remove the sash weights, take out the pocket cover (image 1) and push the "wagtail" (the piece of wood separating the two channels, image 2) to one side. Take hold of the weight and untie the cord so that it passes through the pulley and the sash weight can be removed from the frame (image 3). Repeat this for each weight.

    Step two - Weigh the sash window.

    So that the windows operate properly, the top and bottom sashes need to be weighted slightly differently. The weights for the top sash need to be marginally heavier than the window itself so that it doesn't drop from its raised position. Obviously to use the right amount of weight you need to know how much the window weighs (image 4). Once weighed all you have to do is add one pound onto the total and divide by two and this is how much weight goes on either side of the window. For example if the window weighs 43 pounds the result would be 43 + 1 = 44/2 = 22 pounds on each side of the window. For the bottom sash the maths is very similar. The difference is that you subtract one pound from the weight of the window and, again, divide by two. This will underweight the bottom sash and stop it rising when moved from its closed position. If you don't have scales to hand, supply us with the type of window material and the dimensions and we'll do that for you and even deliver the right weights the next day if ordered before 4.30pm. But it is always a good idea to carry a selection of makeweights to prevent unnecessarily leaving the room exposed to the elements while waiting for weights to be delivered.

    Step three - Replace the weights. 

    A piece of string, weighted with a small piece of lead and usually called a "mouse", is tied to the end of the new sash cord. Thread this through the appropriate pulley (image 5). Move the wagtail to one side and reach in and fish around in the channel for the mouse. When retrieved, the mouse can be pulled through so that enough cord has passed through the channel for the new weights to added. Before adding the new weights to the cord tie a knot so that it doesn't get pulled through the sash pulley once the new weights have been put into the channel (image 6). The weights can then be added to the cord (image 7) and returned to the channel. Repeat for all the weights.

    Step four - Reattach the window.

    Now that the correct weights have been replaced all that needs to be done is to return the window to the frame. Although sometimes tricky, using our Grabba (image 8) all that needs to be done is to thread the end of the cord through the Grabba and its teeth will hold the cord in place, meaning that pins won't need to be used to hold the cord in place if the window weighs less than 40 pounds. If a Grabba isn't being used then it's advisable to cord-up with at least two people as the cord will need pinning into the window.

    An easy balancing act

    Sash windows only need a few components to work smoothly. The most crucial are the weights. Incorrectly balanced windows are at best awkward and difficult to use, at worst they are dangerous - if a 40 pound top sash window drops from its closed position it causes a lot of damage. Following the steps above turns it into a quick, safe and relatively easy maintenance task.

    Want more information or advice? Email us at sales@mighton.co.uk.

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