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
How to a make marking tool. 2 in 1 wood tool. Beam compass tool and marking gauge. Simple, homemade. You can mark to cut wood in the middle. You can draw a parallel line.
In this video, I am making a pocket hole jig. I made a scrap of hard wood. It was a great jig. You should watch this video to learn how to make a kreg jig.