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Since it is difficult to find the center point of a cylinder with a circular cross section, we need the help of such a tool. With this tool you can easily find the center of a cylinder circle. It is extremely easy to find the centers of not only cylindrical objects but also angular objects.
You can see how I made this tool and how I use it when you watch the video. If you're a DIY enthusiast, you'll love this tool.
Enjoy.
Making Video :
This is the page that contains the desktop jointer's videos. You can view the 3D model video. You can download the PDF plan.

My table saw fence is updated. I changed the clamping mechanism of my table saw. Now I push instead of turning.