Elksniper, I don’t want to sound too pessimistic, but from the pipe wrench witness marks on the pin in the picture, it appears the pin is soft and likely significantly galled in the bosses. Therefore, even if you can get to the backside to pound on it, you will take the risk of swelling the pin by hammering on it and make matters worse. Since you are asking for suggestions and are already considering welding a nut on
Discuss this in the forum topic case 580b 1974 outrigger cylinder rebuild.