Did you know that the Chuck Jaws are numbered?
You could easily grab some Jaws, some screws, and secure them to the jug because it all seems like it fits. Fits. However unless you got lucky and put number one in the number one spot with two number two spot, and so on, the Jaws will never tighten as securely as you want them to.
Even if they feel perfectly tight, if you put the number one and the number three slot, one job will be off just enough that could introduce wobble into your piece. For small things You might not notice, larger things, It becomes a very important.
Chucks have a spiral scroll in which the Jaws are machined to fit exactly into their spot in the scroll.
These are precision machined and are almost always labeled. The only set of Jaws in this shop today that you will not find number labels is on the instructor. Chuck and Josh. They also have completely different screws from the other jaws. In other words, do not ever take off the instructor Jaws from that Chuck put on another one.
