My case feeder keeps dropping 2 cases instead of just one. I found the problem tho. There is a black rubber ball that pushes up on an angled piece which makes it pivot and drops a case. That rod that holds the black ball gets hung up and sticks. Won't let it cycle all the way. So it leaves the hole open instead of blocking it part way and catching the nxt case. What can I do to fix it. Tried grease and one shot dry lube on the rod to make it slide easier but still doesn't work.