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I make long C clamps using some hard plywood. You can do a lot of compression with these extra powerful clamps. It is very useful thanks to its long arms. It is also strong enough to break the board. After downloading the dimensions PDF and watching this video, you can easily make Extra Strong Long C clamps. Adjustable distance very useful.
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PDF Download : Extra Strong Long Reach C-Clamps
Did you see this ? GreenSaw G Clamps
A great cordless vacuum cleaner made using the Angle Grinder. Whether you clean your workshop or your car. Do it easily.

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.