Clamp for 12mm linear rail compression type

This is a set of clamps for 12mm linear rod based on my version that clamped the rod by a single m4 bolt in an injection nut.
This version uses clamping like the original aluminium clamp so more even clamping of the 12mm rod which spreads the clamping force accross more of the rod.
It uses a M4 nut inserted in a nut trap from the top of the clamp.
The mounting holes sized for M4 bolts.

The following clamps in this thing:
- simple clamp circular with mount holes
- simple clamp with slotte