WINONA VAN NORMAN FG4000 Flywheel Grinder Refinisher Clutch Grinding - $3,950.00. Item for sale is (1) Winona Van Norman FG4000 Flywheel Grinder. Used, but in very good condition. Comes with a complete centering kit and a new grinding stone. 16" diameter capacity, 5 HP spindle motor, compact size, also usable for racing teams. This is a very clean machine, and it runs nice and smooth.