The O-ring solely for the purpose of holding the pieces together. It doesn't protrude outside of the chucks. When using, I only lost a couple out of hundreds. Some were lost to over tightening and the grain split. However it might also have been the wood. Hard to say for sure.PVC is a very grippy plastic compared to other polymers. That is why I chose it. I thought of steel and aluminium but I decided I wanted to use a sacrificial type of material. Of course it's really nothing to a carbide bit to eat those up!Great question and comments.Sent from Samsung tablet null
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