This is the thread about which grease to use on your axle -
http://www.harley-davidson-hangout.c...le-grease.html
I use the HD grease myself as it hit all the marks, is reasonably priced and easy to get ahold off.
Good luck, sorry to hear about the staple. I had the same with a nail just after I got my streetbob (06), thank 'f' for recovery services I say ...
Cheers, Roy