I am getting a new-to-me baby Mac ready to go to work; I have the missing treadle hooks and was looking at the loom to see how they attach.  I noticed that the bottoms of the treadles are damaged where the lower L shape of the treadle hook seems to move up and down the treadle.  Is this normal?  I have considered sanding them smooth and then putting epoxy on them to harden the surface, but it occured to me that there might be something wrong with how it had been set up.  Since the loom didn't come with the treadle hooks, I don't know how that was done.  Are there any tricks to hooking this up to avoid this damage?