ducksterman

try duct taping a bare copper wire to the plastic cover of the grinder and attach the other end to your kitchen sink cold water handle if it is metal. years ago when i worked as a mechanic we used to attach rubber straps impregnated with metal filings from the frames of cars and let them drag on the ground to keep customers from getting shocks when getting out of their vehicles in the cold weather. question does this happen to you in the summer? if not this will probably cure your problem.

good luck

mike