spiral balancees

The balances are sort of easy to identify. We would normally have you follow our spiral balance guide to narrow down the Series you need, but you gave a lot of information. If, as you say, your window uses a pivot, you are dealing with a tilt window. For 5/8" tilt window spiral balances, we only carry the Series 600. Double check that it looks the same as your old balance, confirm the Series, and consider double checking the tip color. Your white tip should hold a window sash between 4 and 12 pounds in weight. If you remove your sliding sash and weigh it, it should fall within that range.

As for your pivot, your instinct is correct: we'd like to see it. Can you reply to this post with a photo of your old part?

You would choose the 10" Series 600 balance S600-10 and choose the white tip option. And for the 11" balances choose S600-11 with the white tip option. Hope that helps!

I actually don't think those screws are 100% necessary. They are made to help the spiral stay secure in the shoe, but to be honest the spiral should stay secure in the shoe regardless. I think the screw is just an extra measure, like you guessed.