The page states that it is a pivot door roller. I went out and looked at mine and if it has two sets of paralleled rollers (can't tell from the profile drawing), it looks identical. Mine was on my repair list, and when I took the roller out I found that the bolt that connects the roller to the door bracket had backed out. Screwed the bolt back in, reinstalled and adjusted the bolt (the door had dropped down to where the latch was slightly lower than the strike plate) and then tightened the jam nut and it works like new. Maybe this is all the OP needs to do?