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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?
Making Video :
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PDF Download : Right Angle Corner Clamp Making
I am making a jig to glue sandpaper. A great tool for making perfect sanding belts easily and quickly.

This circular saw guide is universal. Suitable for using multiple circular saws. Cutting width can be adjusted.