Need some help identifying screw head type

[Spoonman]

While refurbishing the Creekmore 48 I am trying to remove everything from the mast so I can bust the corrosion and repaint it. I have encountered some screws whose heads are shaped like an hour-glass and the groove is concave. I want to get the right tool for removing these screws as a flathead screwdriver is going to strip them. Anyone ever seen these before and know what they are called so that I can find the right tool?

I've tried to attach photos.

Spoon

[Faster]

Closest I could find is this 'clutch' style, but there's no indication of the concavity of what you've got....

File:Screw Head - Clutch Type G.svg - Wikipedia, the free encyclopedia

[tdw]

How big is that diameter ? Almost looks like it would take one of those curved end deck filler opener ?

[HDChopper]

looks like a Zeus , on aircraft really normal . really it's just a flathead screwdriver kinda thing.. just radius the tip.
the screwdriver for a zeus looks like a really thick round washer pinned by it's center hole to a short 3/8 ext for a ratchet .

Good luck ...

[erps]

Cool, I learned somethin' again. Although given enough time, I can make just about any flat head screw look like that.

[deniseO30]

Clutch List of screw drives - Wikipedia, the free encyclopedia And; screw drive systems and screwdrivers; Automotive Tools - Clutch head screwdriver
There are two types of clutch screw drives: type A and type G. Type A, also known as a standard clutch resembles a bow tie. These were common in GM automobiles, trucks and buses of the 1940s and 1950s. Type G resembles a butterfly. This type of screw head is commonly used in the manufacture of mobile homes and recreational vehicles.


was what I found.

[tdw]

Sometimes this becomes all very disturbing.

My first google searh for "Zeus Screw" came up with a site suggesting "screw a poodle for Zeus". Good lord ! No I didn't delve deeper.

Then I found this "Before Alemites and Zerks, bushings such as the one supporting the shaft on an early 1900s engine were sometimes lubricated by adding grease to a cup and forcing it between the mating surfaces with a screw-type plunger that doubled as a cap for the cup." I suspect that is all very innocent but 'Alemites, Zerks and greasing the mating surfaces seems a tad doubtful'.

Anywho, what I did eventualy discover is that its not Zeus, its Dzus. Invented by one William Dzus, a quarter-turn quick-acting and self-locking fastener. There you go.

A Dzus wrench.



They are very similar but not exact.

[deniseO30]

"Zeus" May be a trade slang word for Dzus, the inventor of the 1/4 turn fastener. Company History -- DZUS ® is not affiliated with DFCI ®

[HDChopper]

DEZUS...you guys are correct , in the USMC we "slanged" everything lol
the round headed key wrench we called a "snoopy" wrench.

[primerate84]

"Screw a poodle for Zeus"? Now that's funny.