Northern Tool has a similar mount for an angle grinder chop saw, but I could never bring myself to spend the $25 or so for something I wouldn’t need very often. Then I saw this: http://www.thingiverse.com/thing:317474. Worked perfect for my application. The clamp I printed was a little large for my harbor freight grinder, but I just wrapped in a strip of rubber pond liner I had laying around. The clamp can be sized to fit, though. Wear safety glasses!
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