The Ital axle is the same design as the old Standard axle from the series 2 , the trick is to use a press to remove the hub , pullers will damage the hub as its a very light construction. Load up press with the bearing /hub to remove to a few tons only ( leave the hub nut loose so everything does not fly everywhere) and then give the hub a large tap with a brass drift and big lump hammer, works every time!!. no need for heat or excess pressure its the shock that breaks the sticktion. Before your build up again lap the hub and half shaft taper with grinding paste , throughly clean before assembling with a new key , this gets an excellent fit for the hub and shaft as any movement will eventually damage the key way and taper . Fit a new hub nut and torque up and use loctite if you do recheck hub nut remember to slacken off first add more loctite
Any further help just ask
Brian
L7 S2