Something else that helps serve as a marker:
If you have a good magnifier you will see that the wiper (the part that turns, has the tiny cross in it) also has a short flat area. That flat is in line with 1 arm of the phillips screwdriver cross.

Anywho, to run my sticks @ 200MHz I have that flat up at the top (top being the USB plug) and tipped just slightly past the horizontal maybe 5 degrees.

edit: looking at that clock pic on mine the flat would be a line from the 11:15 tick to the 1:15 tick marks.