My 20c worth. If you bolt it down something is going to break so that would not be a good idea. I presume you have spun the bottom wheel using the motor with no blade and it does not vibrate, now get a socket and adaptor for a drill and spin the top one and see what happens, if that is ok add the blade and remove the motor and drive the assembly with a drill. The vibration is caused by something rotating so it needs to be tracked down systematically. Balancing as you have tried is static balancing, dynamic balancing is done with the part rotating at a fairly high speed which could be attempted using a drill but it would be very hit and miss and not something I would do.
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Originally Posted by Jay Norton
