You can help the chopping on the on/off o-ring. Iirc, the chops or nibbles on that o-ring occur when you turn the reg on; the o-ring protrudes into the hole and the trailing edge of the hole in the plug grabs the o-ring and cuts a little arc out of it. If you put a tiny bevel on that edge and polish it smooth, it keeps it from grabbing the o-ring. Stay off the sealing surface of the plug though.
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