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S145-4 4 lb Series 145 Balance Spring

Hello I'm a contractor in California. I inspected a window today and pulled these out. Both casings the same size approx 4"x 1" However the coil stamp pound indication was different. In one I pulled out a 4lb and 6lb coil. The other had both 5lb coils. The window that had the 4 and 6 lb coil wasn' ... (cont.)

I am attempting to replace some constant force balances. I believe they are Series 145 Balance Springs based off the design of the tongue and the type of carrier. I need multiple sizes of coils x10 Units stamped #3 x6 Units stamped #4 x8 Units stamped #5 x4 Units stamped #6

It's on both sides of the single hung window, to keep the window open, now both of those are broken, the window won't stay open, the one in the picture is for the left side, but it doesn't have any letters or numbers marked on it, it has 2 springs. Thanks

we only have the name of the distributor (A WINDOW INC.) in Forthworth TXwindow type (SH25/31 Single Hung-Vinyl Frame)

Might you help with this

I work on military housing throughout the country. I'm having trouble replacing these coil balances. The springs are stamped with 3,4,5 or 6. Any ideas?