So I am fixing up my new (to me) SlugFest and about every other pitch throws out 2 balls. When I test it on Fast, the arm rotates about 1.5 turns which makes every few pitches spit out two balls. It's not allowing two balls in the chamber, it's just spinning enough to pitch twice intermittently. How can I slow down the motor or get the sensor to realize it's spun already? Not sure if it's an opto problem but if it is, how do I test?
Video of problem: