I machined bronze bushings for mine. I don't regret it at all and although I agree with the concept that it "could" and "should" wear things out sooner, in reality I doubt if it will be significant. The shift rod housing in the tranny is quite long and lubricated and gives plenty of bearing area. Mine shifted so smooth and precise afterwards it would be hard to say it was a mistake for the benefit it got me and the joy of precise shifting on a 915. It does transfer more noise in 5th gear when in the detent. I forgot to wrap a layer of rubber around the shift rod which I hear can reduce that issue. YMMV
