Paul from SWISCO responded:
March 21, 2019
Starting off with your pivot shoe, see if our 15-177 would be a good fit. This is used with the Series 152 coil springs. Somewhere on your coil, there should be a number stamped. Could we have that number? If not, get back to us with the weight of your sash. |
Bob from SWISCO responded:
March 22, 2019
Hm, because the stamp is on the housing, and not the spring itself, I am not confident in recommending you go with that number. Are there any stamped numbers on the 'tape' of the coil springs themselves? If not, you will need to weigh your window sash. Give us that precise weight, and we'll be able to work out the spring weights you need. |
Bob from SWISCO responded:
March 25, 2019
OK, see our S152-7. One of these on each side would support a window sash weight of 14 lbs. Usually there is some margin for difference in coil balance spring weight, plus or minus a lb. Therefore, this setup would support your 15 lb sash. |