Quoted from ChipScott:Update:
Great success!!!
Got the new set screw installed on the correct/flat side of the stepper motor arm, got the xeno mech replaced, all connectors hooked, and played some pinball!
Everything on that xeno/tongue mech functioned without error. Checked with the glass off across multiple ambush multiballs, save newt, etc, etc, etc....anything I could do to get the tongue magnet to extend, grab a ball and retract during gameplay. Pleased to report that the ball went down the hatch every time without a hitch!!! Gulp!!!
Sorry for posting so many notes about my Xenomorph tongue action yesterday, it was just such a pain in the butt so frequently have the ball not fully retracting into the mouth and then playing the remaining balls and having to then wait for ball search to give the ball back.
I had made comment that the switch was fine and the xenomorph test could be calibrated, but the calibration wouldn't really last.
I had made note about that small little set screw on the round aspect of the rod that comes out of the stepper motor and how it should be more appropriately *flat side* of that rod.
I made comment on how hard it was to get that little black set screw off and ended up having to use one of my machinist buddies to get it out and finally get the screw set on the correct *flat* side of that stepper motor rod ....and then once that was completed and the mech reinstalled, I played some games and all was well.
Sometimes, when we make a move on our machines it works great for a little while and we're super stoked, and then issues pop up again....ah, the lovely world of Pinball, lol... but I'm posting today to just say that I played about 10 games back to back immediately after the fix, and then another 10 games today and every single time the ball did exactly what it should have done (i.e. the pf magnet caught the ball, the tongue extended, grabbed the ball, retracted the ball into the mouth and the ball went down the hatch without hitch every time with a big gulp!
So, I bring this up to just comment to others who have dealt with this. While sure, it may be a switch issue, alternatively the most likely scenario very well may be that the little black set screw there at the stepper motor rod may be on the round side and not the appropriate *flat* side.
Sure, it is a little bit of a PIA to get the mech off as you really have to remove the scoop underneath to allow to get access to the front left bolt, but certainly doable and really only takes an extra a minute or two. Taking a look at that back of that xeno mech and confirming that the little black set bolt is on the appropriate *flat* side of that stepper motor arm really does seem to be a very durable fix.
When I talked to my machining buddy and I told him about this issue, it was no surprise to him, and he is not a pinball guy. I asked him "does it make sense to you that it would not function correctly/durably when this is set on the round side as opposed to the flat side?" He responded quite plainly and quickly "no, it needs to be on the flat side....that's the way this type of mechanism is designed."
So, for anybody experiencing issues with the tongue not fully retracting/holding balls in the mouth and not dropping the ball until ball search/biting the ball, etc etc etc... this issue above is probably the deal.
Anyway, just a follow up to say that this has thus far proven durable now for over 20 games without issue.
Sorry for the long post, but I know this is an annoying issue for others and I wanted to take this time to mention this fix, my interactions with a local machinist friend and comment that this move does very much appear durable (and appropriate).
Thanks