You need a puller designed for removing a brake drum from a tapered axle. A general purpose three prong puller is not strong enough to break the drum loose from the axle. Also the nut needs to be on the axle but backed off about an 1/8 of inch when breaking the drum loose from the axle. The nut on the axle will prevent the drum from 'flying' off the axle when it comes loose and hitting you. A local KF Club member may have a puller or a tool rental place may have one.