question about the 26-387
That 1/8" lip is a problem. The 26-387 really does need a flat edge to wrap around. You could maybe trim that lip away, but I'm not sure if there would be greater consequences for doing so. It would be an unalterable change to your window frame, even if a minor one, so I'm not sure if it's something you want to do, or if it'd even allow the 26-387 to work regardless. I'm sorry that we cannot offer an easier solution.
I just finished replacing 8 window pivot shoes (32 total/4 per window and had to cut the channels with a Dremel to get them to go in. Also replaced all wool weather strip, many locks, some pivot bar sets and 32 spiral balances.. Quite the project but thanks to Swisco all the parts fit and my windows no longer sag (the tops), parameters are weather sealed and open and close easily. Your company has some great "how to" videos and made the project much easier. I could not have done it without Swisco. Special thanks to your team for your help and shipping accurately and promptly.
Awesome, thank you very much for your compliments! That means a lot to hear.
As for using a metal plate, I think that's a really good idea. I agree that cutting the lip will make it look rough and that's obviously not ideal. Our 26-387 actually comes with a few shims, I probably should have mentioned that earlier. You may be able to use one of them to serve that purpose, but failing that of course you could always try to rig a small piece of metal to work.