I am not sure when John Started, but I have spoken to him, and he was out of the game for quite a while. So, he 'seems' new, but in fact he is one of the legends...
Here's some neat info:
...In 1970, [Burton] Spain sold his cue business to tool and die maker, John Davis, who had been assisting Spain for a number of years. Balabushka continued buying blanks from Davis in lieu of Spain during the following year. In 1971 Balabushka met Penndel, Pennsylvania native Gus Szamboti at a tournament...
(Above from Wikipedia)
Now I have some conflicting information (first hand) that in the mid-seventies, Burton still had equipment in his basement, and was still doing cue work. Maybe he was bored with making blanks for George? Maybe he only did full cues of his own? Maybe just repairs? I cannot get any more detail that what I have from that angle.
So, for about a year, John was supplying George. There may well have been some overlap, say when Gus couldn't meet the demand of George. That is pure speculation on my part, but I can certainly find that out for sure. If I was George, I would want to have at least two sources of supply so I never end up with no blank to make a cue from...
As to full cue making, I do beleive John is capable of making a full cue, but it seems he has focused his efforts on making blanks only these days. I did not enquire about that in our last conversation, so it may be he will make a full cue if asked...