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Old 01-24-2006, 10:35 PM   #1
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Special screws with hourglass shaped center.

I have some screws in two Airstreams, a 1963 and a 1964 that I cannot find a screwdriver bit to use on them.

They have a hold unlike a Flat or Phillips head and not a star square or torx, it is like and hourglass.

I have went to every auto parts store and both Home centers with no luck finding the tool I need.

They are on every window crank and latch on the 64 and I am sure they are original, they are holding the table base on the 63. What are these called and where can I find a suitable bit?
Thanks in advance.
RichardT
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Old 01-24-2006, 11:04 PM   #2
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Figured out they were called clutch head screws.

Here is a picture. http://www.retiredtractors.com/Q/JDHeritage/Driver.html

http://www.sizes.com/tools/screw_drive.htm I will grind down a flat head to remove them.
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Old 01-25-2006, 05:47 AM   #3
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richard,

i have a set that i no longer need. they were for a 46 chevy project i sold.

contact me if you are interested...

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Old 01-25-2006, 05:54 AM   #4
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i take it that this elvolved into a robertson?
norby
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Old 01-25-2006, 09:44 AM   #5
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Clutch head screws are an automotive fastener. Robertson (square drive) are a construction fastener. Bits for both can be obtained from Snap-On or Mac tool dealers. Good industrial tool suppliers should also have then. Like the Star drive screws, clutch heads were an attempt by the auto makers to prevent tampering by owners and forcing them back to the dealers. They have since given up on that and now frustrate us by mixing metric and english sizes in their vehicles! Darol
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Old 02-19-2006, 07:47 PM   #6
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Aces hardware has them

I was able to find the clutch head driver at my local Aces hardware in thier RV section for around $7.
One thing I found with these goofy screws is that they are almost impossible to strip out. I was able to get a good hold on all the clutch head screws that are under my '63 avion and covered in road crust and rust.
Normally though, whenever I remove a clutch head, I replace it with a stainles steel philips head.
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Old 02-19-2006, 08:15 PM   #7
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I was able to find one at a local mom and pop hardware store for $1.85 just the other day.
I will most likely not reuse the screws.

Richardt
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