Really, folks, all I wanted to know is whether there is something special/distinctive about the screws Martin uses to hold their tuning peg gears in place. If so, I wouldn't want to replace it with a generic guitar-tuning-peg screw, much less a generic screw made for other purposes.
If not, of course all I need to do is find the right size screw.

It may be a "non-issue," Old Dude, but I did not know that -- even after having consulted with a friend in town who is a guitarist and former guitar store owner.

And, no, I do not want to take apart one of the other tuners to see what the screw looks like. Maybe I'm being overly cautious, but if one of my tuner screws worked itself loose, I don't want to invite another one to do the same.    I'd rather take it to a nearby guitar shop and hope that they can direct me to the right size screw.

Micca and Peace, thanks for keeping it light (even if corny)! LOL

Genie