Having read all the DIY articles on addressing the knocking noise, I pretty much eliminated all that I could find and fix myself.
The question I have now is for the Tensioning Rod, Part# 24. From what I can see, this rod (or its parts) does not move when in use. There are no moving parts that come in contact with it while in use. So, how is adjusting this rod a potential solution to any knocking sounds ?? I have a very simple mind. I just can't figure out why some people say this "may be" one of the culprits. So, what am I missing here ?? (before I put it back together again for the 6th time).