I think that piece is called a detent, (it's what allows the shift drum to turn and stop as the shift shaft pulls up or pushes down on the drum points) it looks like he put a roller bearing on the end which would help smooth it out a lot, because that little wheel dosn't really turn well (meaning you'll probably get a more positive feel), anyway I tried contacting him a few times by calling but no one ever answers the phone, so I'm gonna try and leave a email.