So I have just removed all but one tires off of my kart in order to clean the axle. The back right tire for some reason will not come off. We have tried to use PB Blaster for the last three days and whacking it with a hammer, but nothing has moved at all! We even tried to torch it, but nothing has budged. The key inside of the hub seems to be every so slightly not flat and parallel with the axle so could that key be the problem? I just need some suggestions on how to get this wheel out please.