Good way to lose skin at this point
OK,, that axle can be a *****. You will have to lift the inner end a little (bear down on the outer end) to get it to slide into the carrier, probably have to turn it a little to get the splines to engage, slide it in until it gets to where the splines on the hub and the end of the axle interfere then turn the hub a little to align the splines and push it the rest of the way in. WATCH YER FINGERS!! at this point, those splines are sharp and fit close, just about room for 3/4 of a layer of skin between them.