I keep a shaft collar clamped on the rear spindle extension of my lathe. It provides a grip for a small “gear puller” that I use to unlock MT1 fixtures from the spindle.

The only time that I remove the collar is when I am cutting screws and need to turn the spindle by hand, while cutting the thread with a die. Then I install a clamp-on crank.

The problem with this is that screw making involves alternation of motor powering (cutting the screw diameter) and hand powering (thread cutting). I do not want the crank flying around under motor power, so I alternately attach and detach the crank, over and over again. A tee handle driver is required each time. I often forget where I last set it down (age factor), so additional time is lost in search.

My “fixed spindle reel”, of which I have recently made ten, requires 15 screws.

I have now made a new crank, one that slips over the shaft collar.

It drives the collar, and therefore the spindle, by two axial pins that fit two holes drilled in the collar.

So now I never remove the collar and never have to find the tee driver. I just have to remember where I last set down the crank.
Now that this innovation is in place, I am developing a new reel design that has only three fabricated screws.