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Costs a lot of cash but its main use is for 2" radial bristle discs. They're more expensive but real pro stuff. Talk to Joe as he uses one. I'd like to have one but can't afford it now.

You can get knockoff sets with flex shafts and variable speed for as little as $30 if you catch the right sale. I bought my Motomaster set used for $15CDN and been using it for about 4 years now,...