Clearly Visible Mark

[as_ap]

In the rules, it says that the screw and wheel and axle have to have a "Clearly visible mark" to prove that it went the full rotation. What does it mean by clearly visible mark? Does the moving object need to leave a mark or does the screw need to have a mark already?

[Uncle Fester]

Think of the nifty checkerboard patterns NASA puts on rickets to tell if they're spinning or not. mark whatever's turning, and mark it well enough so a judge can easily tell. If they can't tell, AND IT'S THEIR CALL, you haven't followed directions.

Make the mark thin enough to be accurate (not a 320 degree stripe), and big and contrasty enough to be easily seen. make sure the mark can be seen from outside, unblocked by other components.

Note that it says "A" mark. Not "many." Don't give anyone an opportunity for confusion or someone else an opening for a complaint.

Sounds like I've seen every possible argument about this one, ya think?