If you have a milling machine, dropping an end mill down the center of the uneven TF pushrod hole will round it out and make installing the rod or tube easy. Then just drill it back out in the new location,no? A big, heavy, rigid drill press might work but you have to be careful because the bearings aren't designed for an uneven load. I'm considering tubing my ProMaxx 171's but I need to look into whether or not opening the pinch is going to help or hurt considering the other somewhat limited porting they will see. The bowls already look pretty good, but that is a topic for another thread.
