I’ve been watching this thread from the start, and didn’t want to derail from the track it was on, and I still don’t.
I think this project is now mature enough for me to add some products / design / ideas / alternatives input for consideration
A while ago, (in another thread) I suggested something like these
There are also these ( I know chip clips were mentioned above )
The only reason I am suggesting they may still be an option, albeit not as good as your design, and would need a mod, But mentioned for arthritis, here’s a quote
" These chip clips come recommended by one of my clients who says they are the perfect amount of pressure."
Here’s a link for anyone maybe wanting to test and possibly modify
A consideration for this would be, maybe down this line
or this
Anyway, enough out of me,
Your designs are awesome, hopefully there is something of substance in this post that can help it along further