Originally Posted by
Butterflyblue
Quite embarrassingly, I have a screw leftover, though, and I don’t have any idea where it came from. It’s about 5/8” long and oddly shaped. I’ll attach a picture. Does anyone recognize this screw and have an idea where it goes?
Don't be embarrassed, glad you've made such great progress. It appears to be a set screw for a deeper shaft, maybe to set the main post of the tension unit? Look for a hole or shaft somewhere about that diameter, remove whatever plates or covers you need to.