Balance for MW Window

A home owner from Hilton Head, SC says:
I have MW vinyl windows in my house built in 1999. One window the balance broke on both sides (not the one pictured) and the window stays up only because it's locked. The diameter of the plastic sleeve is 3/8". Could you tell me what parts I need? I looked at your step by step identifier and didn't see anything that matched. Thanks.
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Tom from SWISCO responded:

Hi there! I definitely think we can help, yes. Looking at your balance, and based on your tube diameter, you have our Series 900. I am confident this will work for you.

Also note that you may not need a balance at all. Spiral balances are convenient in that they can be wound up, like a toy, to regain a little tension. You can use a charging tool like our 75-006 to give your current balances a few turns, maybe 2-3, and see if you feel any tension build. If so, you can give these another couple years of life. Just something to consider. Just make sure not to over charge it or you can risk damaging the spring irreparably. You don't want to give it more than 5 turns.

A home owner from Hilton Head, SC says:
Thank you. Is there a pivot shoe that would work with the Series 900 and my window?
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Paul from SWISCO responded:

We have known customers with MW Twinseal windows have used our 15-219 pivot shoe as a replacement. However, you will need to remove your pivot shoe out of the window to compare your measurements with ours to see if it is a match.

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