its automatic, there is no adjusting it once you bolt it in, and let go of the center screw with a small screw driver, you can not force it out further, wont happen !.It is automatic but you can manually tighten since in only goes out w/o a screwdriver. What are you calling a slack adjuster?
Really . / Slack Adjuster = the device on side the jug , which is held in by two bolts and has a plug on the end , which when removed gives access to the spring caging screw , you screw the screw all the way out , relieving pressure from the shaft , then stick it into the jug while holding that screw , after the bolts are tight , let go of the screw and the slack adjuster is adjuster
OK. Slack Adjuster = Tensioner. Is there a way to know if it is bad? I was able to retract it all the way and it popped back out. I suppose it might not have the pressure it once did.
What your calling th spring caging screw is what I was talking about manually adjusting or testing. From what I have read you can turn it maybe a 1/8- 1/4 counter clockwise turn and it will put more pressure on chain. And from me fooling with it only seems to go out i.e. once its out it wont go back in without turning that screw.