I would like to add ...
Shafts should not be added again because it would cause all sort of
'now illegal' jump cues to be manufactured and sold.
What do you do when you match up for a money game (in my case, it was
a big money game), and the player pulls out an 'illegal' jump stick (one that is shorter than 40" and the large tip exceeds the maximum tip size for jump sticks).
I played a 'machinist' that made his own jump stick, shorter than 40", and had a tip on it that was 20-25 mm, and he was good with it. It looked like a club!!
At the time I played him, I was giving him the 6 and the break, and he is
6'3" and 300 pounds. We played for 29 1/2 hours straight, and it turned out to be a costly lesson for me, because I wear hard contacts, and my eyes started to break down after 23-24 hours of wearing contacts.
Needless to say though, I told him I would not play him again unless he
used BCA and VNEA approved equipement.