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Tom from SWISCO responded:
March 23, 2021
Sure, we can help with this. The reason your windows can't stay up is because the balance has lost its tension, probably just due to age. The good news is that you have spiral balances, which is unique among other types in that you can charge it to get it some of its tension back. You can do this by using a tool like our 75-006 to rotate it 2-3 times. Assuming the springs aren't totally shot then this could give them another couple years of life. I'll share a video at the end of this post that will show you exactly how you can do this. Assuming that the springs are shot then you just need new balances entirely. In your case you have either the Series 900 (3/8" diameter tube) or Series 600 (9/16" diameter tube). You just have to measure the tube to get the better match. Concerning the pivot shoe, I'll need you to remove one from the window and measure its width and thickness so that I can find something that fits in the same track. Here's that video I mentioned: |
