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S770-39 39" Series 770 Balance

I'm the president of an HOA for a condo building in Raleigh, and I have a crap ton of these window balances that are bad. They are similar but the top and bottom are slightly different sizes - pictures attached. Shorter balance is numbered E30E and longer one is numbered E34D. If you can help me ... (cont.)

I can see various 39 B 39C 37C and 37 B, 4 balances in one window.

I have Mastic windows I need two left side window spring balancers 2 left side spring balancers 4 screw plastic retainers

We've been contracted to repair several broken sash spring mechanisims in varying size windows. Please provide a direct email for correspondence.

Good evening. Can you help me identify three parts on my windows? I need to replace some spring balancers, the shoes, and some latches that release the window from the track. Thanks!

We have 5 large double hung windows I would like to renew all the balances and worn parts. All 20 balances are old with rusty springs and various Brocken parts. LocationSanford MaineMarty

Very large aluminum AMACOR (Frost-Chek) windows in need of rebuilding. Very hard to open and close (very tight and heavy). Each side has (2) channel balances (pictures) with broken ropes, etc. The existing INTERIOR window balances have (2) balances with "4030" stamped on them and (2) with "40 ... (cont.)

These balancers are from 2 different windows. Both are tilt windows and the balancers are 1/2" wide. They both have the same ends as pictured. So, I need 2 of the C2745s, and 2 of the C3920 (52)s. Please let me know if you have further questions. Thanks, Jimmy