OK, I got a chance to go out and look, and I get it now, sorry for the previous confusion. 3 different adjustment screws...
Anyway, it is the one on the top left of that whole system, and mine is secured with a lock nut and painted red.
First, how much did he turn it? Is it possible to just try to get the paint to line up again and determining the depth of the screw by and residual paint/no paint on the root of the threads?
Second, I've checked nine on a 1999.0 off and running, even operating the throttle, and the screw isn't even in contact with the stop by about .7-.8mm. I will double check this at hot off and running conditions tomorrow when I drive it. I can get accurate measurements for the gap rather than a guesstimate and for a lack of anything else, you just set yours there and see...
Just let me know...
B