Arutha:
I’ll answer your question when and if I get one back together that actualy runs. 
Seriously, most of the ones that I’ve worked on are 17 jewels or less. But yes… I have to turn the collet to get it to keep time. Additionally, since I don;t have the electronics that I need, it’s a matter of time consuming winding/running/recording/positioning/adjusting… and on and on.
Thanks!
Tom