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Raven it is a sleeve I made of brass. I took a piece of pvc stock and turned it down and drilled a hole in it to accept a .500 dia. ss pin. press fit. I then took a pvc 3 way connector and cemented the the plug of pvc into it. When dry I pressed the pin into the plug. I then drilled out the upright and then turned a bushing made of brass and pressed it into the upright. Then inserted the pin, slip fit, into the upright. Both sides typical. As far as the vise grip I think you are talking about the other holder post. The vise grip jaw was a bitch to drill. I had to use a carbide drill bit, hardened stuff. I was going to weld it but figured if it didn't work I would still have a vise grip to use.
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