Leveling feet for Workmate 2000 or any 20x30 rectangular tube

Due to regular usage of my Workmate 2000 the endcaps (rubber feet) gets hollow (see white circle). I want to have new one, but made of standard components. So I designed an endcap with a nut inside for the usage of a standard M8 leveling feet. The endcaps are glued with a little bit silicone at the rectangular tube of the foot. The insertion of the nut can be done with a dummy filament change (see the gcode).

If your rectangular tube have the same dimensions 20x30x1.1-1.3mm you can use the cap for your project.