That's what I expected the case to be when I first noticed things, but upon closer inspection there is no threaded hole/b-screw at all, or anything that outwardly appears to be broken off. That's why I'm so confused- there don't appear to be any adjustment screws at all besides the H/L stops. I was hoping someone had had this model of RD before and knew what controlled the tension, because I can't even figure out how it was done in the first place.