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My Klein ones came from Amazon for about £35 quid ish for the set of 3, next day too so no anxiety waiting for new tools😁
 



Google says the head of the flat bit is 6.4mm so with the screw holding function of it then it probably will do it but there might be a bit of play sideways.(assuming there’s room for the end to fit if fixing back detector heads or sounders)

I’ve just tried a few different m4s from the random bit box and there’s some variance in the slot width between manufacturers.
Using a standard 1/4 flat screwdriver bit, either a 7mm or 8mm flat bit would hold the m4 securely enough to hold it upside down without the screw falling off.
 
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Google says the head of the flat bit is 6.4mm so with the screw holding function of it then it probably will do it but there might be a bit of play sideways.(assuming there’s room for the end to fit if fixing back detector heads or sounders)

I’ve just tried a few different m4s from the random bit box and there’s some variance in the slot width between manufacturers.
Using a standard 1/4 flat screwdriver bit, either a 7mm or 8mm flat bit would hold the m4 securely enough to hold it upside down without the screw falling off.
Actually, ignore the 7-8mm reference in my last post, I think that’s the width of the bit across rather than the slot size.
 
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RDB85

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Screw holding Screwdriver
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