Spiral balance?

Thanks for posting. I think we can help you replace these Spiral Balances, but I am going to need the length and diameter of the outer tube, not including the end attachment. It may be easier to do this by removing the spiral from the window; that way you can also provide us a photo of any end attachment.  Many thanks.

Thanks for the added photos. Sorry, I was not clear earlier--there is no need to remove the spiral itself from the spiral balance. I merely meant spiral balance when I said 'spiral'. Apologies for any confusion.

Now, onto your measurements. This likes the outer tube's length, minus the end attachment, is either 28" or closer to 28-1/2". Could you confirm this, as I see both possibilities in your photos. That will be crucial to determining the right length. The outer tube is unfortunately the part that has mostly crumbled away in your photos, but just measure to the tip as best you can. 

Secondly, spiral balances are either 3/8" or 5/8" in diameter. From your picture it would look like your outer tube is closer to 3/8". But this would be very unlikely; your balance has a black tip, which is found only in thicker, 5/8" spiral balances. Could you double-check this measurement, as best as you can. I know it is difficult, with most of the outer tube crumbling apart, but it's the only way to knowing what you need. Let us know what you find. 

Hm, OK thanks for double-checking. I only asked because a 3/8" Spiral Balance has never been made with a black tip. Therefore I don't exactly know what you have, but it seems pretty unusual. Could you give us the precise weight of your window sash? We could then use that precise weight to determined the colored tip you need. Many thanks. 

Sorry, let me clarify. So the window sash is the sliding part of your window that holds the glass. The sash is what your spiral balances enable you to open and close. 

Your spiral balances are calibrated to support a very specific weight range that your window sash must fall into. If your replace your balances with ones meant to support a weight heavier than your window sash, it becomes very difficult to open your window; if replace them for ones meant for a weight lighter than your sash, then your window tends to slide open. The calibration has to be just right. For spiral balances, the different calibration options are represented by the different colored tips. 

Unfortunately, the sticker on the window probably isn't going to have this weight. The only thing you can do is get a bathroom scale and weigh the sash. Remove the sash from the rest of the window and place it on the scale. Be precise as possible. Once you have this weight, we will try and narrow down the right spiral balance for you. Thank you for your patience! See the video below for details on removing the sash as well as replacing your old spiral balances.

OK, thank you. Based on the weight and other dimensions you've provided, you should take a look at the S900-29 with a red tip option. The red tip is for a window sash in the weight range of 10 through 22 lbs. Take a look and see what you think.

Our balances have metal tubes instead of plastic tubes. The plastic tubes your balance had at one time are the same exact thing as our metal tubes, its just mad of a different material. The metal tubes hold up better and won't crack like yours have.

As for installation, the video Bob linked to explains the exact process you want to follow. I highly recommend watching it, if you haven't already.

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