Quoted from MK6PIN:Adding another:
Buying a specific # of bulbs for a machine, counting the order (correct, and all counts match)....setting them in a neat pile on the bench, as you will get to the game that weekend. Weekend comes, you have the machine apart, going well, get to the last item (I usually change the pop lights last, as they can be a pita sometimes) only to find you are 1 short!!! Impossible...I just counted them 3 days prior!!!
That's why I ALWAYS add 2 or 3 additional bulbs, per color if I have to. Dont want to be in that situation.....