Mobile, AL
I adjust the flipper with the ring installed to a zero degree angle with the feed guide. Like --. I don't trust the holes because I used them at one time and had to go back and readjust flipper position to match the feed guide. Toothpicks will flex too, and cause the adjustment to be off.
I snug the crank to the flipper shaft, check for correct up/down slop, then look down the feed guide from the tip of the flipper and make the face of the flipper ring match the face of the feed guide. Then torque down the crank screw/bolt.
Haven't used the holes in years.
IMO...YMMV
