After I had a moving motor and arm, I now needed to use something to allow the dot to travel on the outside of the wood. I thought that a simple paper fastener would do the trick. It turns out: almost.
The paper fastener worked, but the dot needed more freedom. I ended up having to pinch the fastener to a round shape so that while it was being pushed around, the square sharp edges wouldn’t get caught. It was like working with clay – you push this way and that way but each time you can over-tweek and ruin it! After much tinkering, it finally worked. 🙂