If you own a Fiber pencil by TA+d you might have the same issues I’ve been facing for a while: a wobbly button that jiggles too much because the tension spring is simply not strong enough. After some trial and error, I found a solution by adding a short spring to the back of the Schmidt cartridge. Now the button is nice and snug.
Video’s too big to upload, so here’s a link to my thread on X instead.