The sidetrack of the window has a broken fitting in the mechanical fitting, making it difficult to used.

Thanks for posting. I am afraid we did not receive the documents described, however this likely wouldn't be of much help anyway, as codes often can't be cross-referenced to hardware. We need photos of what you're looking for and a description of what it does. We'll see what we can do from there.

Thanks for your patience. Looks like you need a new pivot shoe. That's what we call that block piece the spiral balance attaches to and from which the window pivots. This might be a lot of different pivot shoes. What we ask is for you to remove the shoe (preferably an undamaged one) and measure the width and thickness and provide a closer photo. That should help us narrow down what you need.