Proving im a beginner question with basic pyramid brep

Another ‘i feel stupid asking this’ but i can’t find how to make a damn pyramid, seemed so simple…

Im trying to make a grip texture for my knife handle surfaces. It’s like those chiselled textures on gun handles.

like this:

So i thought simple pyramid texture, except i can’t make the pyramid into a solid at which point im again stuck wondering how things work or dont in GH and feeling like a stupid 35 year old experience programmer who hasn’t understood programming!

I try hard before i post the question… I tried grafting and flattening but not the solution. Where did i go wrong?

grip (11.9 KB)

grip (7.7 KB)

feeling stupid it was that simple! Thanks HS_Kim!