Jack, I'm intrigued by your bench grinder; how have you mounted what appears to be a wire wheel and a buffing wheel outboard of the grinding wheels?
I presume you've attached spindle extensions in place of the normal nuts that secure the wheels and then cut holes in the side guards for the spindles to protrude through. Are these commercially available extensions, or did you make them up yourself?
What's the overall balance and harmonics like with all that lot?