I say pull the fork toward the end of the axle on one side just enough to get a tool in there to flatten the axle. Then once you slide that side out the proper way without hurting anything, you should be able to slide the other side out over the end of the axle. ...I think. Otherwise repeat griding on side 2. I only say to only do one side because then at least you leave nice threads to get everything off of the axle on the other side. Sure, you may have to get a new axle, but better that than a new fork. The replacement axle will probably be better than whatever came on the wal-mart quality wheel anyway.