Use the axle cover cap as a pattern to make a disc out of 1/4" steel or aluminum plate, and find a socket a little smaller than the diameter of the axle tube snout. Then use some all-thread rod and nuts to pull the plate against the socket. The drum, bearing, and hub will follow as you tighten the nuts. Three pieces of threaded rod will probably be sufficient.

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!