Quoted from too-many-pins:

Running a tap in is your best way to go. By re-tapping you are not doing any real tapping just cleaning up existing threads anyway so you are not going to hurt anything. Back in the day when we were building racing engines we always re-tapped every thread in an engine to be sure bolts went in cleanly to get accurate torque readings when we torque things together. Anything short of retapping is a mistake.
I have also found retapping threads in all cabinet bolts before installing leg boths saves some issues. When I remember I always retap all 8. The problem is 1/2 the time I forget. It is a bitch to get old!
Nice thing is one tap does all bolts & leg levelers so all you need is one tap for everything involved with pinball legs. I have one epoxied into an old socket (in my pinball toolbox) so I can just use my 3/8 drive tools instead of a tap handle. That way I use the same ratchet for both the tap & socket to put legs on.