Apparently, the craftsmen liked the idea of using a core on a special stand, and this craft appeared during various improvements. To make this site you will need a metal plate and a square pipe.
The refinement consists in adjusting in two planes, so you will need a pipe of different sizes and fixing bolts. A small piece of pipe is welded onto the steel base, into which the bracket with the core itself will be inserted.
For convenience, a return spring is installed in the guide sleeve where the core is located. The steel plate can be attached to the workbench using a clamp or for self-tapping screws through holes made at the corners.