The flange I can't get off of my E-12 deck motor shaft appears to have a rusty keyway on it as does the shaft. If it were screwed on, it seems that it would have to be a RH thread or it could come unscrewed when mowing. The motor turns CCW as seen from the blade end. I've tried a puller with penetrating oil and heat with no success. What is IIRC by the way? Bill