My wife says it works far better than the method of just using a spring. she made five bracelets for a test drive, before wandering off to work.
As a improvement, I’m doing another and adding a rounded groove to better direct the beads down a row (just because).
To make the clamp block still work, I’ll rabbit the area of the block the depth of the groove.
The sides stick up about 1/8”. Originally to cover the plywood edges, the lips stop bead-floor chaos.
The new one will not have a lip on the back. This will allow the user to push the string/cable/nylon out the back to leave enough to secure the ends.
Yesterday, I down loaded “printable rulers.” If you follow the advice and remove the command to adjust for page size, they are close enough to my machinist ruler for most simple projects.