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I designed up some frame plugs and a friend of mine with a lathe, turned them up for me.
They were two part items with a polished stainless screw pulling the two halves together expanding an O-ring, to grip the inside of the tube.
They grip very well indeed, but ultimately were over engineered, as all it needed to be was a single part with a correctly sized O-ring groove.
I discovered that if mine are adjusted just right, they will push in tight and prize out again easily enough.
Dookbob made some really natty ones for his 600.
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