It was somewhere outside Barstow when Roy Smith wrote:

You risked attracting the wrath of the tool gods by cutting up a perfectly
good hex wrench??? :-)

Well in that case I'm straight to Heck.

There are any number of occasions when I've needed some magic
punch/chisel, and taken an Allen key either out of my toolbox or
bought a cheap set from the nearest market stall/ / garage, then
ground and heat-treated it to suit.

It's like locking yourself out of the car, then using a windscreen
wiper to get back in.