I would love to give credit where credit is due but for the life of me I can’t remember where I saw this idea. I want to say it was Wood Mag but I can’t be for sure. I saw something like this before and thought what a great idea but what if I want different sizes? So I came up with this. I line up the cutting tip of the saw blade to the edge of the wood and drew a line and drilled a 3/16 hole every 1/2”. So now I can cut a perfect circle from 1” to 18”. In the picture I made a 5” but it was to big so I cut it down to a 4” just by moving the pin from 5” to 4”. Its just that easy. I tried to cut one free hand but I really didn’t like how it turned out. Thats when I made this.