You have to remove the ladder from the side of the coach. You can then take the loose bracket off. You have to get the old jamb washer out or if there is enough room push it back out of the way. The new jamb washer has to be pushed and/or hammered back into the tubing, remove the screw, attach the old bracket, and then reattach the whole ladder back to the side of the coach.
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi