duff screw removal!

[bry1975]

Imo safest bet would be to grind the screw head flat as possible, centre punch, drill(short stub drill if poss.) and loctite a lump of bar into the screw body a good 10mm deep, loctite with 638 leave for a good few hours to cure.

[Variomatic]

You can get micro drill bits and Archimedes drills on Ebay:

http://www.ebay.co.uk/itm/20pc-Precision-Miniature...

http://www.ebay.co.uk/itm/1mm-Brass-Archimedes-Spi...

Quality isn't always great but for a one-off job you should be ok with them. Don't be tempted to use drills this small in a Dremel or similar - you'll melt them almost as soon as you start!

You shouldn't need to re-tap if you drill carefully enough and packs of stainless steel screws are available as well once you know the thread size (probably 1.2mm):

http://www.ebay.co.uk/itm/Stainless-Steel-Screw-As...