Clamp for on plank with rod underneath

Yet more plank clamp things, what can i say, i have a plank above my table.

This one basically only cares about plank thickness and minimum distance from the wall. (20.2mm and 6mm resp.) You have to provide a sufficiently long rod to stick underneath. (as usual you can use tape/file a bit)

The rod isnt in there you have to make/find own of the correct length; longer than `pl-2*dx = pl - 23mm`. The 'safety pin' isnt included either.(Its from another print i heated a nail through)

It com