Make sure you drill and ream the holes straight. Chuck up one of the old 6mm pins in your drill press and slide the truinon onto the pin then clamp the trunion in the vise. Put the 8mm drill or reamer in the chuck and go to town. Much eaisier than using and indicator. If you try and do it without aligning and clamping you will be buying new trunions (ask me how I know [:@])