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I'm unsure of what the screw on the collar is like but maybe substitute a cup point set screw of like size. Thinking more about it, a half dog point set screw is an option, too but be careful of overtightening ...

Looks like you could also add an additional collar as a possibility. ------------------------------ Tremaine Parsons RPT Georgetown CA (530) 333-9299 ------------------------------

If the problem is the set screw working itself loose, perhaps Loctite Blue 242 would help. It's not my first choice but it is reversible with basic hand tools. However, I'm wondering if the problem ...