EE WAS ATTEMPTING TO CLEAN UP A PISTON ON THE WIRE WHEEL SIDE OF THE SHOP BENCH GRINDER. THE TOOL REST WAS BROKEN OFF & ONE WAS ON ORDER. THE GRINDER SHOULD NOT HAVE BEEN USED. EE WAS HOLDIN G PISTON BETWEEN HIS 2 HANDS & PISTON GOT CAUGHTIN THE WIRE BRUSH & CAUGHT THE TIPS OF HIS FINGERS