It is keyed and tapered, the proper puller should take it off. I used a puller that used three of the lug bolts, a jaw type gear puller is probably what you used to break the flange. A little heat can be applied to the hub, not the axle, to help it come off. I had to put a good bit of tension on mine then smack the puller bolt a good lick and it popped right off.