I want to revisit this thread because, in spite of getting lots of "miles" out of my rebuilt starter, it is now doing the same thing. In fact, I got more miles out of the rebuild than I did the original, likely because of how I used the button differently (see above). What I'd like to know is if anyone has found the exact part match for the bearing. Indy_WR450 suggested a way to get the exact bushing in rulon from a distributor. However, when I call the distributor (Tri-Star Plastics/tstar.com) , they tell me, in spite of what the catalog implies, that the part number (see Indiy's post a few messages back) is a special order. This unfortunately means a minimum order of something like 500 pieces and lost of bucks. So, has anyone successfully replaced the rear bushing/bearing in the starter of a WR450?