Quoted from jrpinball:The goal is to make them play as they were designed to play; no more and no less. .
That is all well and good at home but on location my customers want games that play fast and fun. The ones who want slow and "How it was supposed to play" in 1966 are either dead or don't hang out in bars anymore
I had my high-tapped Card Whiz on location for years before it broke a drop target. $4 for a new one and all is good. Williams and Bally I generally do not touch but the 2" wedgeheads and some of the 3" mid-70's Gottliebs seem to benefit.