how big like as big as it can to fit into the holeDevin ,That's what an idiot would do..., Try drilling it out, but be careful. Or you could get rid off one head of the bolt by kind of sanding it off with a drill bit, get a thick drill bit and just try get rid off the head of the bolt then hammer out the rest of the axle.
that will just strip the only 6mm allen key that i have, i tried drilling it for an hour and a half but only got half waytry hammering a larger allen key into the hole
I dont have 20 bucks....
and i could probably get a hacksaw in there and cut the head of the bolt offSo the Allen key holes are rounded? Stripped is what happens to the threads of a screw, bolt or nut.
It seems your drill bit is either blunt or too small, use a sharp 1/2" twist drill and make sure it's spinning the right way.
If you have access to an angle grinder you can grind the head the axle off or cut a slot in the head to make it like a slotted head screw.
Another option is to JB weld some little handles on to the heads of the axle.