Quoted from DW3000:

You’re looking for part# 02-4837 and a couple 1/8” e-clips for it. Marco and a few others (I think?) have it for a buck or two.
https://www.marcospecialties.com/pinball-parts/02-4837
http://www.actionpinball.com/parts.php?item=02-4837
Hopefully you’re lucky enough to still need to order something from a place that has it.
But if you’re otherwise going to get hit with $15 shipping on a $1.50 part, let me know - I might have ordered a spare and if I’m right about that, I could drop it in the mail for you. I’m all too familiar with the horrible USA>Canada shipping rates (which is probably why I bought a spare haha).
The e-clips are just standard 1/8” ones you can get at any hardware store. Nothing special about those, thankfully.

Quoted from DW3000:

I know I at least have my original hinge pin, and I think also a new unused one. There wasn’t anything wrong with my original aside from a bit of wear, but I ordered a new one along with the new diverter since I figured I might as well replace everything at once. I’m almost positive I ordered a couple of them and I can’t see myself needing a second new spare any time soon though.
I’ll take a look probably tonight and see what’s there. Only reason I say “probably tonight” is we’re getting a new puppy today so I imagine I should have a chance to look, but we’ll see what the new puppy decides
Take a look at the “Bally Grey Parts Manual” on Planetary Pinball, and/or also I think the Service Bulletin Update for TZ (on ipdb?) - it has the missing illustration/parts list for the diverter listed in it that wasn’t in the manual to make sure you have everything else.

Quoted from PinRob:

I have some TZ stuff. Only interested in continental US buyers right now.
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Quoted from jawjaw:

When the powerball is kicked out of the trough, do you get the Powerball animation on the dmd? Same should happen when the powerball is ejected from the gumball and before kicked out of the slot machine. Those would tell if you the proximity switches are working correctly. If you are going into powerball multiball, the game must think the powerball is in play (powerball inserts should be lit) and right orbit opto is triggered. That opto may be bad which would mean the diverter never activates. When something doesn't get activated over certain number of games, you get a credit dot for it. I'm hardly the expert at this stuff but I would check all switches and optos. Bang around the pf and see if optos trigger. Had that happen on one game. Opto worked fine in testing but triggered on vibrations.

Quoted from Coyote:

Because it thinks there is something wrong with the diverter, and therefore is in 'error' mode. All powerball modes are 'simulated'.
Try clearing the error by:
(1) Make sure that A.2 24 is not set to 'Yes', and A.2 26 is not set to 'Yes'.
(2) Going into Gumball Test, let it do a Continuous Mode and let it run for a good 5 minutes and see if any errors are thrown.
(3) If no errors are thrown, then do a factory reset.

Quoted from jawjaw:

I said check the opto. The diverter coil will fire based off of the opto. Everything in the game is controlled by switches/optos. If the powerball does not go back into the gumball machine when in play and the multiball starts randomly, it sounds like switch issues.

Quoted from Mad_Dog_Coin_Op:

I totally agree with this. The problem will return until the wires have been soldered in place. I soldered to the backside of the boards. It seemed a little less offensive visually.