Quoted from gumnut01:Thank you Matt! Now I know I need to fix it. Mine was so noisy I could not hear the speakers with volume on 5 and it gave me a headache. The lithium grease did help, it's not whisper quiet but it is a lot less noisy than it used to be.
Ok. Fixed the vibrating machine. It was the soccer ball. Beware of heavy grippy soccer balls which may have thicker rubber on one side compared to the other. The replacement ball from Marco fixed it.
Now to fix the assist ball eject mechanism. 5% to 10% of the time the eject kicks weakly to the right, rather than straight up. I have new saucer, new eject mechanism, new solenoid and sleeve and the spring is fine. Looking at the mechanism it looks like there are two parts on the same pivot, the Ball Eject Spring Assembly (A-17907) that comes from the solenoid and the Eject Cam Assembly (A-7471-R) which travels through the saucer and has contact with the pinball. These 2 parts appear that they should move freely on the mounting bracket pivot (A-18146) but not contact each other on the pivot. I am also guessing that all the hap hazard violent movement from the solenoid be taken up by the Ball Eject Spring Assembly and NOT transferred to the Eject Cam Assembly. When I push the Ball Eject Spring Assembly all the way over to the right of the pivot it will work flawlessly for about 20+ ejects. But then it starts to become erratic again. Trying to work out how to make this mechanism work 100% of the time. I have seen similar posts on other sites, but it has not been resolved. image.jpg