coil balance parts

A quick learner from Old Lyme, CT says:
The enclosed picture shows what may be a Capitol Window. The builder of the house referred to Capitol and I researched and found MI Windows and Doors make a coil balance that appears to be identical to the one in my picture. You show parts that look correct, but the balance shoe has a plastic lock mechanism instead of a metal one. I found a #740 on the spring for the one I need to replace and the size of your 15-181 and 15-180 look about right. Will the plastic part work in my application.
User submitted photo of the coil balance sytem in their Capitol window.
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Paul from SWISCO responded:
Yes, the nylon fittings should work. Let me know if you need any further help.
A quick learner from Old Lyme, CT says:
Does the #740 on the series 190 spring equate to a certain weight in pounds? If so what are the number of pounds for the 440, 540, 640, 740, and 832?
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Mike from SWISCO responded:
Thanks for posting, Bill.

For the Series 190, the numbers indicate different strength coils, rather than being equal to a specific weight. These numbers can be found on your original coils.
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