Mini Compass For Circles

John Heisz on YouTube created this mini compass with wood (https://www.youtube.com/watch?v=5owEwcrbe2w). He later printed it when he got a 3D printer. I was able to find someone else's adaptation of his design on Printables but I wanted to make some changes. I have made the model to use a standard toilet bolt and nut (¼-20) instead of the printed threads. The underside of the bottom has a perfect pocket for the head of the bolt.For the top piece is designed to accept a push pin for the pivot point. This is a very tight fit. I have found that not all push pins have the same length pin. The total height of the bottom piece and the top piece is 10mm, so you should use a pin that is over 10mm. (The pin I used was 10.4mm from the plastic bit to the tip)The original model was 2.5mm thick. I increased this to 5mm to accommodate the toilet bolt. An added benefit is that it feels quite a bit stiffer. I created 2 different bottom pieces:For mechanical pencils - the hole is 1.2mm diameter in