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Sem's right lads.

My old MAF had 6 point security torx screws (i.e. normal torx bit with a pin in the middle) and the draper set from ASDA worked fine.

However, my replacement MAF has a 5 point security screw. I researched them a bit because I wanted to try a Merc MAF but you cannot get hold of them - they are sold to approved dealers only and are called torx plus bits.

There is only one way around this (that i could find) and that's to use the 2 prong bits that come in the standard draper sets, they can be used very carefully to bridge the pin in the centre and wedge between teeth to unscrew the sods. Then replace them with with self tappers like I did to solve the problem in the future.
 

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I managed to undo them with a good set of pliers , takes some patience / time .. then i replaced them with some stainless self tappers with a 'normal' cross head drive ... they are self tapper type screws not M5 , M6  etc .
 

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I'd check if you have ordered the correct bit as it's most likely a 5 point torx screw, not the standard 6 point [;)]
I had this problem after buying a set of security bits, In the end I managed to break off one of the points and file it down so it wasn't in the way. Not the best way to do it, but it lasted long enough to get both screws out and back in.
 
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