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I use a 4 and various smaller ones for razors, I also like having the wheels on their own arm instead of the flat platten, just too much going on when I need to focus on the wheel. I like the blaze in the really big grits, but if I can use a gator, that's my pick hands down. They just produce beautiful and easily controllable grinds for me.
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Just set this up for grinding razors. For whatever reason, having the larger wheel has dramatically improved tracking. I also have a 4", 5" and smaller wheels down to 1/4" on separate arms.
http://i889.photobucket.com/albums/a...pskoyfrepp.jpg