Very much like the old rear drums on our cars back in the 70's. I'm not 100% but one side might be reverse thread. Cars were but I'm not to sure about the HD. I would back off the linkage for future adjustments before playing with the star, and have your handles in. Jacking the back end might help you test how tight your brakes are. Too much and you'll get a squeak that will drive you up a wall.