I use this model to mount some machinist stones so I can use it to sharpen knives. You can buy them from all the usual online stores. Ex: Amazon or Aliexpress.
It is a parametric open scad model so you can make the model fit all kinds of stones. If you get the size right you can just press fit the stones.
You will need nutsnbolts an OpenSCAD library that allows for simple creation of nuts and bolts and respective nut catches and screw holes.
The author marked this model as their own original creation.