I know this topic is old but, I have a good location that claims 2 Oak 1 inch capsule heads are 'not working'. I found 1 of the coin mech sprockets was so loose it was ready to come off. I tightened it and that seemed to fix it. (I ran 10 quarters through it to be sure). The head next to it seemed to miss vend 1 out of every 10 times or so... It is an Oak 1 inch head with a .50 cent mech and capsuled California Gold for product. What can cause this? It's a very good account so I plan on just replacing the entire head with a new coin mech next time I am in. There is not a pac man gumball riser installed on this head.
Also, when should a pac man gumball riser be installed? I am guessing gumballs, round capsules, or bouncy balls (anything round right?) Will all of these products vend incorrectly without the pac man gumball riser installed?