Quoted from davidpizon:

I realize this isn't much to go on. It's a long shot but...
All of the machines have thumb locks.
“The Addams Family”
Has clear plastic ramps instead of factory "smoke grey” like the cloud topper. The three magnets under the playfield each have an inline fuse holder added. Shooter rod knob is clear red plastic.

“The Incredible Hulk”
Contains a “Ni-Wumpf” CPU board instead of the standard factory board. I added green grounding wire with screw hole terminals across all boards including “chime” board. The "Extra Ball" insert is very saucered.

“Flight 2000”
My friend, Eric Strangeway, from whom I bought this machine from told me he wrote his initials and the date when it was serviced on the filter capacitor on the driver board.
“Fireball” (head stolen)
This has been repainted in newer brighter colors. The overspray from the original factory paint can still be seen if the head is opened. I still have the matching lower cabinet with a matching repaint job.
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Added 2 days ago: I forgot to mention that the apron on the "Addams Family" had been spray painted black. The artwork on the apron is a decal instead of the factory screen printing.