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Holley carburetor vacuum secondary metering plate screws

I just cut the tip off of one of my screwdrivers and ground it into the shape of a clutch drive. I have been using it for almost 40 years on Holley carbs.
 
I just rebuilt a spreadbore Holley with the same metering plates and used a phillips head screw driver to remove the screws. I have 2 differrent size clutch head drivers but they never fit. Just put a lot of pressure to prevent slipping.
 
In 1981 I turned 16. I had Dad's tool kit. Three screwdrivers, a hammer and pliers.
I've been able to remove the screws with a flat blade screwdriver before but not on these 2 600 CFM carbs I have here.
In 81 I got out of the Navy....Dad kept his tools away from me.... The Mac tool dealer & I got to be friends...
 
I’m a bit late to update…
I did order a set of clutch screw sockets and they did arrive.

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The one that fits was sprayed yellow for quick identification.

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It fits snugly.
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Score!
 
If I have a kit of tools and there is only one piece I need for a particular job and the rest usually just sit I do similar with masking tape.
Mainly because I don't want to wait for anything to dry.
 
Paint often eliminated the Hey, that is MY wrench conflict.
My stuff was usually a Petty Blue.
Here in the garage, I paint some specialty stuff a specific color. The 9/16” box end gets orange, 1/2” gets blue.
Maybe if my eyes were better I’d skip the short cuts.
 
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