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 hexagonal 13mm head.
2. If you don't use flexible matherial for pads, you should add more gaps between groove and pad spike (or don't use pads at all).

UPD: added photo with 75mm M8 bolt (first one).

SolidWorks assembly source included, feel free to customize it. Simplify3D factory files included as well.