Holes for tubes can be a bit tight and may need opening with 5mm drill bit for perfect fit.
I used 5mm brass tubes, they are press fitted but can be glued in place for a more permanent solution. M8 nut is also press fitted so you don't need any glue. Bolt cap has a 6,8mm hole so it can be tapped with a bolt, it requires some force but gives you a tight threaded connection.
Absolute maximum desk thickness is 25mm or 30mm without bolt cap.
The author marked this model as their own original creation.