As an ex-teacher of metalwork I can say that this was a favourite for many boys to make - I have several I made myself as a kid - centre lathe work (facing, drilling, knurling), screwcutting, forging, bench filing, hardening and tempering - only drawback the handle often unscrewed when undoing tight screws - clever lads cross drilled and put a locking pin through the handle - drilled, countersunk, rivetted and turned smooth in the lathe..... Lots of processes to be taught/learned....