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After watching this video, you can download the free PDF document and make it easily. There are many 90 degree corner clamp videos on youtube. But this is a little different from what I did, let's see, do you like it?
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PDF Download : Right Angle Corner Clamp Making
When you watch this video, you can learn to make a center marking tool. The center finder is a useful tool for woodworking. You can mark a cylinder or square.
You can use it both to drill 90 degree holes and to drill holes in the depth you want. It also works for joining two woods together, you can see in the video.