i am trying to help my uncle fix his bellows because all the shops are tied up for weeks.we got the manual and it says to pull the hinge pins with a slide hammer.i tried that and they wont budge.i put a grade 8 bolt down thru a socket and tightened it trying to pullit..that broke off flush.ive hit the pins with a hand sledge and they wont go in either.i have the lock bolts out.its a 1992 250 .says sp on the drive.does anyone have any secrets to this problem.thank you in advance.