Nut&Bolt-based strong G-Clamp with flexible pads

Needed a strong G-Clamp to fix things on the shelf. Existing g-clamp model knobs, weren't as catchy and handy as I would like. Also I have flex filament sample, and decided to add flexible pads, so I recommend you to use plastan/elastan/flex plastic to print them.

**Warnings!**
1. I've used 40mm M8 bolt and nut (13mm width hexagonal head), that's enough for my application. But In order to clamp narrower things, you need a longer bolt, than on my real pictures - more than 65mm M8, with hexago