Just wanted to see if anyone else has ever made an eccentric sphere jig to the instructions given on David Reed Smith's website. He's got a couple different versions pictured like these:
PVCSphereJawsEccentricRing.jpgSlidingPVCSphereChuck.jpg

I'm really intrigued by the sliding version with vacuum. Just wanted to see if anyone has built one and how well did it work. Did you feel safe using it? He doesn't sell them, just puts pictured plans up on his site. He's got some really cool plans for a bunch of "stuff" just wish he made some things for re-sale.