Quoted from CrazyLevi:
I don't get too carried away...
I bought the best game at the entire show, an awesome Williams Toledo Friday. I left it on the floor for Saturday, cause why not? Game is 43 years old (like me!) and another day ain't gonna hurt it.
unfortunately the ball started getting stuck under a rubber on Saturday. Really nothing I could do. I was busy, didn't have any tools, and had no real motivation to fix a game that I didn't even bring to the show. I did remove the ball from under the plastic a couple times but gave up as it was a losing cause and I had stuff to do (like play in the tournament finals).
Shit does happen sometimes. I do think if you bring a game to the show you should bring some basic tools and be prepared to do nominal work on it if you need to.
As I mentioned earlier, sometimes there are issues after the fact and that is understandable. Last year I brought two games to Pinfest. One was awarded the "Grand Champion" ribbon. Both machines were solid and performed 100% throughout both days of the show and got a lot of play. I sold them both at the end of the show.
I always bring a small toolbox with me when I bring machines. Stuff like spare bulbs, a voltmeter, and the basic hand tools needed in case something fails. Plus a wrench to remove and install the legs. I bring my pinball cart too (which I usually end-up loaning to others bringing pins in and out).
There are usually plenty of people there with tools that will loan them to you if you need them.