Bob from SWISCO responded:
November 16, 2020
I believe this shoe might be an older version of our 15-228, but look over the dimensions and let me know if they match. If so, this shoe uses either our Series 160 1/2" thick springs, or our Series 165 3/8" thick springs. Compare both with your old springs to see which you need. Unfortunately, the '6 vs 9' issue is always a problem with coil balance stamps. The only way around this is to obtain the exact weight of the window sash that uses these coil balances. Give me that exact weight, and I'll work out what you need. |