unlike other AC cocking rods this one has no end adjustment . so length has to be exact, it has to be threaded in all the way !. i don't know if this will cause problems with other back blocks , i so far haven't had any trouble.
The rubber bumper supplied with it is Absolutly useless! it's so soft it just gets tiwisted up between the rod and back block . i replaced it with a harder rubber bumper of the same thickness and it seems ok .
the best thing is that the threads seem to be a bit tighter that other rods . which stops it from backing out during play like most did for me.
Not a bad product overall . I like it it works great of me .