Quoted from chucksmith:
(update: 1.05) (adjusting the ball sensor switch) (refer to photo)
Step1: Test your ball switch be sure you have this problem. (mine started after installing lane protector)
(not the fault of the cliffy, but the cliffy raised the ball just enough so my switch did not make contact most of the time.
Step2: Try raising the switch - loosen the screws and raise up. (for me it was not enough)
Step 3: (only if needed)
(Turn machine off or you will get smacked by the auto launch)
Press wire (ball sensor) down from the top with one hand
Carefully adjust (bend) wire portion of switch upward by a millimeter using a needle nose.
Now the leaf will be pressed down more on the switches actuator button when a ball is present.
This sounds like you do not have the Cliffy's installed 100% correct. I have these in my TWD machine. It took me a while to get the fitment right and the ball should not be raised up. The best way I found to get them seated right, is put both side piece on, but not screwed tight and simply run the ball up and down the shooter lane until it pushed the cliffys away. This allows for the ball to be seated in the shooter lane property, meanwhile having the cliffys positioned as close to the ball as possible (without getting in the way of the ball = no raised ball).