Quote:
Originally Posted by plod
I think you have it wrong buddy
I've upgraded from 4-40 to M3's on a number of occassions, and M3 is slightly larger diameter than 4-40 so IMO you have it the wrong way round.
If you look on LSTforums, there are pages on the subject of upgrading from 4-40's to M3's for greater strength.
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I second this... 4-40's have a slightly smaller diameter and a coarser thread than an M3 screw.
You can try re-tapping, but if the 4-40 has stripped the hole clean there won't be much material for the M3 screw to grab either, unless you can fit a longer screw instead or maybe a nut on the other end.