Mark Lee, you always make me chuckle.
Firstly, Gibson truss rods are adjusted using a 5/16" SOCKET, and secondly a phosphor bronze Allen Key would be about as much use as a chocolate fireguard-it'd be way too soft. In fact, I've never hear of Phos.Bronze being used for any kind of toolmaking (before I went full-time with music I was an industrial toolmaker in the Aerospace industry, and it was certainly never used there, or in the automotive sector, in which my Dad was a development engineer)
KSDaddy is a highly skilled and experienced professional luthier, and he was cross-questioning you because you were/are offering homespun advice about something that, if executed wrongly, could seriously damage someone's guitar.
Many people come to these forums for advice, and I would say that if you can't give it in a constructive way, with cogency and experience, then the best course of action is just to keep quiet.
Just my .02, of course.