Clutch fastner screwdriver

[1930]

I have one of these, same as E-bay item No 360556362660 but I do not know what it is used for, Ill assume A/C automotive clutch but cant remember seeing a need for this tool on any A/C work I have done.

[Papaw]

Not for clutches and not for A/C.

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.  Type G is not necessarily tamper resistant because type G can be removed with a flat-blade screwdriver.

http://en.wikipedia.org/wiki/List_of_screw_drives#Clutch

[john k]

To remove the radio from a 1950 Chevy, you got to have them, also to remove the sheet metal from a 1950s era John Deere tractor.   Have a couple of them, and used them once maybe in the past 20 years. 

[lbgradwell]

The eBay example appears to be a Type G...