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S770-29 29" Series 770 Balance

I have a window balance marked 29B TSI AK that looks like your 770 series, but it is 9/16" depth insted of your 1/2". Will that be a problem? From your Discussions page discussions/stamp-2900-bsi-77-2647 the photo shows the spring length to be 13,1/2". Mine is 15,1/4". Will that be a problem? My sa ... (cont.)

stamp reads 2900 bsi

The options listed for SWISCO series 795 are the numbers stamped on the original channel balances for this particular window balance system. The options indicate spring strength. To find out what option is needed remove the window sash and put it on a scale. Stamp option 29A will carry a window ... (cont.)