Spiral balance for double hung windows

A handy person from New York says:
I am fixing some old double hung windows that have spiral balances. The plastic tube around the spring is brittle and has cracked into many pieces. Otherwise the spiral balance is working properly. Are replacement plastic tubes available? The tube length is 26 3/4 inches and the diameter is 5/8 inches.
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Tom from SWISCO responded:

Thanks for your patience in this matter. Your balance isn't made anymore, but we can still help. Whenever we encounter this old model we like to use our Series 500 spiral balance as a replacement, along with a bottom bracket like our 17-007 or 17-012. I think in your case you'll want an S500-27, based on the length of the original. Look these parts over and let me know if you agree.

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