Willie B
Silver Member
Use DOM (Drawn Over Mandrel) tubing. Tack up the welds attached to your dipper. After welding, the pins won't fit any more. Valve grinding compound, (an abrasive paste) on the pin with lots of manual effort, and/or a die grinder to dress the tubing to fit the pin. If you can tolerate some level of looseness you can dress the pin to fit the bushings. If you have lathe access, put replaceable bushings in the tubing.