as title says. can't pound them out w/o mushrooming, cut the mushroom off flush and try again. still wont budge. Out comes the smoke wrench. heat the outer part cherry red and the cut off flush part FINALLY starts to move. then they put the hole for the pin straight horizontal, with the mule drive retainer bail right in the way.... wound up hitting a flat punch with a bigger flat punch to drive that one out...… can't drill them either.