15mm Rail System Clamp

Finally purchased a rail-based rig. Getting started making some parts for it.

Centre hole is sized for a 1/4" bolt.

Requires two M4 nuts, and two 24mm M4 bolts.

Hole dimensions calculated with:
y = 1.0155x + 0.2795 vertical
y = 0.9927x + 0.3602 horizontal
(source: https://innovationstation.utexas.edu/tip-design)