How to remove a striped Hex Screw?

I contacted EK about getting some replacement screws for the block, and they said I need "M3x12 7991 DIN"
Can't seem to find any online, any one know where I can get some? I need only 1 or 2.
I still haven't tried removing the striped screw yet!
 
Ok here is a pic when I first got it. Didn't get a pic of the striped screw though! Block is back in the loop so cant remove it yet. I will take it apart in couple of weeks.

5926530638_a0d43d31be_b.jpg
[/url] 030920101343 by Avathar77, on Flickr[/IMG]


Update :
Just got a response from EK saying they can send me some spare screws for P&P charges only, it is going to be 4EUR, so not that much more compared to the link hyperst gave(thanx for that by the way)
 
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I was thinking of gluing the head of the hex key which came with the block, or to make a grove using the dremel so that a flat head screw driver would fit. I have some small enough nuts as well! I will see if that works as "Bring the Rain" said.
Going to order JML screw extractor as well, because I have some other striped screws in the house here and there :)
 
I found some M3 12mm contersunk screws in the fleebay, turns out to be half the price from EK postage quote, but not sure about the quality(half quality:confused:)
One is saying 10.9 hardness grade and the other 12.9. Also some are black and some stainless steel.
Now I am assuming 12.9 is better than 10.9, and to get the black ones.
 
So finally removed the frekin Screw!
Used all sorts of things but it was the extra virgin olive oil that did the trick! :)

Thats the only happy part as I found out My cpu block is effected by Nickel flaking issue!

On to RMA! :(
 
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