It is hard to get it off the pinion shaft.
The crush changes I have done have been from the back with the pinion out upon reassem.
That's why it is so import not to overcrush the sleee.

Why would you want to change the crush ? Did the pinion nut have too much load on the bearing???

On the oil return, you can just hash it at 45 degrees w/sandpaper [80 grit] to get them clened and recut.