Constant force coil balance

A home owner from Sharpsville, PA says:
I am unable to find any other markings or numbers on this balance other than the number 840 on the spring.
Would like to replace the entire mechanism. We bpught this older home about a year ago and can't identify the window manufacturer. Says Therm-O-Loc on the latch if that means anything. Any help would be greatly appreciated. George O'Leary
User submitted a photo of a coil balance.
A home owner from Sharpsville, PA says:
My best guess is that I should order 2 each of parts 15-140, 15-143, 15-144, 15-145 and S150-8 (window weight is 16 lbs) to replace both balances. Does that sound correct?
Profile picture of Tom
Tom from SWISCO responded:
I agree with the parts you picked out, yes. Just triple check to make sure your dimensions are all the same.
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