Quoted from MrBally:

I disagree with your statement;
I worked for a route op from August '79 to June '85. Pinball was big for a good portion of that time. When a service tech had a call, the rule was to get the game up and running bringing in quartrrs. We all carried drywall screws, nuts & bolts, drills and taps etc. We would bypass burnt connectors soldering jumpers to the rectifier board test points splicing into the wiring near the burnt connectors. Heck, Bernie Powers of Bally Field Service mentioned how a jumper to a test point or ground will keep a game earning if you did not have connectors and terminal pins. with you.
Remember, these machines were designed and developed to make money for operators. Tournament play, home collectors and long term durability for a home collector were not high on the priority list.