One way grinding wheel balancer

[mattthemuppet]

thanks for pointing this out to me, good to have another option and shouldn't be too tricky to machine one either. AFAIK they use a similar system for balancing surface grinder wheels, although in that case they're hubs which the wheel is mounted to and then mounted to the spindle. You can do a "poor mans" version by drilling and tapping holes around the periphery of the arbor then attaching thick washers with screws at the light point.

I also balanced a couple of treadmill motor flywheels using a DIY jig and skateboard bearings, then drilling a divot at the heavy point until the flywheel stopped randomly at all points around its diameter. Worked really well and got rid of a bad vibration on my lathe.