Fitech Rotor Phasing

IMG_4659.JPG On the adjustable rotor, which way do we twist the thing? Fitech instructions are confusing.
http://fitechefi.com/fitech-uploads/2016/07/QuickStartGuideFinalV5.pdf

I'm shooting for 15* BTDC. According to Fitech, once I have my spark tower and rotor lined up to #1, I should twist the adjustable cap clockwise 15* or leaving the slot length longer on the left side? See above pic.

Watching another tutorial online for a SBC which rotates in the same direction, they twist that adjustable rotor in the opposite direction.