Bob from SWISCO responded:
November 5, 2023
Hey Brian. This looks more like a 15-177 Pivot Shoe to me. This shoe uses Series 152 Coil Balances. If the sash weighs 24 pounds, use four of the S152-6 6 pound springs, with a pair on each side of the sash. This will equal 12 pounds of support on either side of the sash, for a total support of 24 pounds. These springs attach to the shoe with fasteners like our 33-072. If you need new housing supports for the coils, you can use the newer style 15-143, 15-144 and 15-145 components. These 'sandwich' around each coil spring. Let me know if you have further questions. |
Bob from SWISCO responded:
November 6, 2023
Of course, I'm sorry for misunderstanding your original post. Rereading it I see now that you did say the sash was 28 pounds, not 24. With that in mind, two 7 pound springs per side should be perfectly sufficient. As for lubrication, I suggest using silicone spray in the track. I like that more than WD-40 since it's less likely to attract dust and debris, which can clog things up. We don't sell any but you can pick it up at any local hardware store. |