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Tom from SWISCO responded:
September 17, 2020
You don't have a 15-046 pivot shoe, you have the 15-180. This is designed specifically to work with the Series 190 spring, so that's what you want to look into. I can see the problem right away; your current springs are only rated for 5 pounds of support each. With two on each side, that's only 20 pounds of support. Like my gut on Christmas, your window appears to have gained 6.5 pounds. That's not a big deal, though, we can easily compensate for that with a new combination of springs. I think a better combination now would be to use one 7 pound spring and one 6 pound spring per side. That will give you 13 pounds of support on each side, for a total of 26 pounds. That should be fine, you won't miss that last half a pound. With that in mind, I recommend an S190-740 and S190-640 coil spring. You can reuse your old shoe and clips, they should be totally compatible. |
