Hey friends, I've enjoyed getting into the hobby of fixing up project EM machines. I have 4 so far, all are Williams machines. Not by choice, just happened that's the brand that I kept coming across. Two are from the 60s and two are from the 70s. I feel like I've learned the Williams components decently with help from other Pinsiders.
My question is how will my knowledge translate if I work on another brand of EM in the future? Are there huge differences between the manufacturers in the 60s and 70s? If I come across a Gottlieb or Bally EM from the same timeframe, will it all be pretty similar, or vastly different?