Bob from SWISCO responded:
August 4, 2020
This does indeed resemble our 15-177 Pivot Shoe, which uses the Series 152 Coil Springs. For a 14 lb sash, a S152-7 7 lb coil spring on each side of the sash will do the trick. These newer springs do indeed attach differently to the shoe, using a screw like the 33-072 to attach, but they will work as replacements. Let me know if you have any other questions. |