got this set of thread files a couple years back and boy am i glad i did.
saved me some serious time and money so i thought id share

http://www.grainger.com/Grainger/WAR...lar&cm_vc=SFMP

has almost all sizes you would need for the quick fix of any cross thread bolt.
used it yesterday on my sink, wrench slipped and bit the brass threads.
broke out the set and cleaned up the threads good as new.

and no i dont work for grainger or the manufacturer

 

i've had a set for several years. both sae and metric. handy item for sure. steve