I have searched the forum and only found the exterior dimensions of the pulleys for my 31 ft. Hi-Lo. I want to replace all the composite pulleys with aluminum ones. Some of them are already busted and have fallen on the ground below the camper upon lifting. What I am looking for is the center diameter for the bolt that goes through the center of the pulleys. My camper is at my son's property (where no one actually lives). I want to gather all the parts for the lift system to rebuild it before I go out to where it is. All the cable and related hardware has already been ordered. Just need to order the pulleys. Thanks for any help!