Question for "Something Simple"
Great work products that have obviously satisfied your clients. Watch out for the cookies, though. Once on the lips, always on the mid-rift! Seriously though, there are many of us that have developed difficulty in the use of our hands. For us, door levers are easier to turn than door knobs. Similarly, in designing jigs I always use levers instead of knobs, for the same reason. But, overall, your design is great.
What is the gadget in the last image? It appears to have a routed grove on the long edge, and its sides, all around, are slanted at an angle. How did you achieve that angle all around the contraption. Is that the "clapper" you mentioned?