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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
This is the page that contains the desktop jointer's videos. You can view the 3D model video. You can download the PDF plan.

I decided to do it myself. For this, I used a 10mm leaf drill bit that I had at hand. The result was even better than I expected.