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Screwdriver 5910 890 2420

Liazard

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KM-55. In the Stihl repair manual it says to use screwdriver 5910 890 2420 to remove the nuts that hold the air filter housing on. The tool number is represented on Amazon by "carburator adjusting screwdrivers" that are way too small. The nut looks to be about 1/4".

The nut is in a plastic tubular thing and screw onto a protruding threaded rod, which apparently also hold the entire carb on (photo attached). I have the feeling that a 1/4" socket that's deep enough to extend past the threaded screw will be too thick to fit between the plastic tube and the nut.

Does anyone know what I need to remove these nuts?
 

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AVB

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As Deets066 said it is a 8 mm. Most 1/4" dr 8mm deep well sockets will work though it is a tight fit. One solution for that is to thin the outer shell of the socket a little; it will not take much.
 

JB-PlantHeirloom

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If the socket is too thick and you do not have a nut driver, try a pair of curved locking surgical forceps/clamps on two of the flats, it can not be on there that tight. The latter is pretty handy for doing fuel line hoses on small equipment too.
 
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