for my fork to mount my new headlight bracket on. I am cleaning this bonded plexi pattern together which I will centrifugally cast in aluminum, clean to a final finish, make a rubber mold of (and subsequent wax copies) and then cast the final product. After casting, I'll toss them in the lathe for an accurate 35mm ID, drill and tap a hole for the bolt, and then cut the slot that will allow it to clamp shut.
Wish I had a picture of the headlight bracket itself.