Pencil/dry erase marker
Step 1: Find an appropriate drum head and find the center of circle
After obtaining a drum head, the next you will have to do is find the center of it. I don't have any pictures showing how I did it, but here's a video that I think is excellent in showing how (minus the Macintosh voice over.)
Note: In the first step when you draw a line somewhere, I drew mine parallel with the Slingerland logo so I can make the clock lines parallel/perpendicular with the logo.
Also, I would not suggest using a sharpie on the head as it may not come off and it will show through, mine reluctantly came off with a Mr. Clean sponge. But I would stay on the safe side and use a non-permanent marker or a pencil.