A gear puller has no place to pull from..The sleeve fits tight against a shoulder on the crank...The new US41 I have here has no sleeve, just a straight crank extension sticking out from the case about an inch....There have been many different sleeves used over the years, some on a straight crank and some on a tapered end...G62s have used 2 different styles, one threaded onto the crank and another slipped over the taper and were held on by a nut..I think most of the Quadra and US 35s and 41s, when used, are Loctited onto a straight extension....I have always used heat to remove the sleeves, have not damaged a seal so far.....