Just a note hear on something I recently did. I put a French freewheel, (English thread) on an early phil wood freewheel hub. Once in place I realized the two smallest cogs were skipping and worn. Let me just say removal was exceedingly difficult. The removal tool would not fit over the phil wood axle. It required complete axle removal with my makeshift tools. Fortunately I seemed to not have ruined anything and it was cool to see how it all went back together but I will never put a French freewheel on it again.