First try an easy out, depending on the bolt dia, a hole will be drilled into the bolt (I'd recommend using a left hand drill bit if available as this alone may work the threa out, if not...) then use the appropriate size easy out. Easy outs are prone to snapping if not used correctly especially the smaller sized ones. And they can be very tough to drill through.
Failing that drilling and re threading to the next size up may be an option but depending on theatrical where the hole is situated, a helix oil may be recommended.
I have taps and drills but don't at the moment have smaller easy outs (snapped
) and also prefer to do smaller thread sizes in a more controlable drill set up to ensure the drill is coaxial to the fixing etc. which I don't currently have available to me, however I hope the advice is useful.
[size=67]Where we're going we don't need roads!
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