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I am yanking the motor out of the wife's old treadmill(shhhhhhhh don't let her hear that.) You wouldn't think it, but most treadmill motors are over 2 hp and have the speed control built right in to...

2" is the standard, however charlie Lewis swears by a 1" wide one. As far as wheel size, its personal preference. 8" seems to be the most common one but it will depend on how much hollow you want in...

I'm in the process of building one of these myself, and i'm going to be modifying the contact wheel from a 2" wide one to a 1" wide one to make it easier to build razors, but with the standard...