Hi, there is a pin, so if you slide the collet in it will engage on the
pin. What I haven't figured out is that the threaded ring that would
screw onto the collet is mounted on a ball race, so it is
free-spinning. If I were able to get the collet to screw onto this
collar, I could then tighten the outer knurled ring on the chuck which
pushes out the tapered collar (with the indexing pin) to compress the
collet. The only solution I have though of so far is to make a sort
of drawbar with a short thread on it to screw into the back of the
threaded ring. The short thread would allow me to lock it onto the
ring, thereby giving me something to turn on to engage the thread.
I'm pretty sure this isn't the correct method of mounting a collet in
the chuck, hence my post to see if I was missing something.