Went out to replace my door locks on 8427C - had done the front one before. No problem on the front, but when I pulled the panel cover off the interior side of the door, there seemed only to be a small access area on the inferior side of the metal sheeting, where I couldn't access the 7/8" nut that holds the lock in place. After fiddling for awhile, I thought I'd seek the advice of the experienced seers here (rather than bloody my fingers any more). Anyone have experience pulling this lock for replacement? TIA.