Happiness is soldering replacement parts on a pin's circuit board and actually having it work!
Long story short - my Gorgar had some fuzzy sound issues so I changed the original capacitors to new ones. Looked great but then I had ZERO sound when put back in the pin. I started doubting my ability to handle circuit boards. Even resodlered in the old caps just to retrace my steps. Still no sounds. All test points were at proper levels. So, I ordered a new 8w amplifer chip/transistor from Action Pinball and soldered it in place.
It worked! Sounds are better (stronger, smoother). All I can figure is my original amplifier was on the way out and the new caps sealed the deal.
It really adds to the satisfaction when playing the pin knowing you have fixed something that was previously very foreign to you and made it better.
So, what's your success story that made you happier with your pin?