Screwdriver, what's it called?

What's the type of screwdriver I need to remove the secondary metering plate from a holley 1850?

Thanks,

 

It's called a "clutch head". I can't remember if there's a specific size, though...old age.

Devon

 

Thanks...

I haven't been able to turn up a size yet on google or at the holley website. You'd think this would be easy to find, lol.

 

If it is a clutch head (not a torx) you can take any old slot screwdriver put it on the grinder and grind it down to your size clutch head. Been doing this way for years on my tri-5 chevys.o No:

 

The answer is 5/32". I ended up getting bits that fit in a 1/4" nut driver. Amazon.com was the cheapest place I found to get the bits. Everywhere else either wanted you to buy them by the 100's or rape you on shipping.