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.
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.