Your groove is not deep enough (meaning all the way through). Switcj to a die grinder or dremale for the last 1/8" go slow and almost cut through-then hit with a chisel to snap and clean cut. Do not use an adjustable 3 jaw puller. You should be using one of these:Anyone have a trick to remove a pitman arm? I've tryed cutting a groove into it with no luck. I've already broken three pitman arm pullers with out any movement.