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Message: <blockquote data-quote="Tazza" data-source="post: 99107" data-attributes="member: 82">If you're talking about the bobtach part, the part that tilts and not the arms where the tapered pins lock in place, they do wear. The issue with boring them out is, you need to bore them straight, you have no reference to be able to make both sides are exactly the same. You may be able to get lucky if the machinist is good, they can throw it on a horozontal mill and line it all up the best they can.The way i have done it is to remove the old bosses with a grinder, plasma cutter and a lot of spare time. I then mounted the bobtach back up with the new bosses/pins. The taper in the arms will hold the pins straight and then i welded the bosses into place. Go slow or the metal can twist somewhat.</blockquote>