Replacing the axel is an easy repair if it broke.
Not so easy if it pulled out as you need to find that ###### clip which came off.
You might need to put a thrust washer between the clip & the axel casing if it is badly damaged.
The important thing is to clean, clean & clean again the entire case before you separate the halves then do the job as quick as you can in the most dust free enviroment you can find.
I do mine in the workshop shower after wetting down all of the walls.
Use petrol soaked scotchbrite pads to remove the old silicon from the cases and use a fresh tube with a very small hole in the end to apply it, you do not need much.