Delrin knurls fine. I would think whatever They are made of, should be similar. Loctite makes a glue. Can't remember the number but it's black max. I have used it to glue parts together to machine them. Soak the parts in acetone to dissolve it. Some plastic doesn't like acetone so test first. I worry that heat will push material out like kneading dough. If you have a spare bushing, never hurts to try.