Thanks Anthony. I was wondering , it looks like there is some locking cement on the threads , but it appears whitish in color. Can I turn it off from the outer locking nut which is located just behind the adjustment knob? A new needle valve assembly would just replace that whole section including the part that holds the tubing as well? or just the outer locknut where the dial is located?
The 40 dollar range sounds like the better deal in my case. Thanks again