<VV> 'Hour-glass' head screws?
hugo at aruncoaches.co.uk
Thu Jan 2 02:15:33 EST 2020
A clutch head is a 'one-way' security screw that you can tighten but
not undo. What are those weird 'hour-glass' head screws on the 95? I've
just been wrestling with some of them while changing the throttle cable
on my Corvan. I had to grind down an Allen key to undo them. Luckily
they weren't too tight nor corroded in place. Why would they use such an
unusual head - I don't think I've ever seen them before?
On 2020-01-02 02:43, FrankDuVal via VirtualVairs wrote:
> I have not been into a heater switch. Should be similar to other
> switches, like the windshield wiper or turn signal of an early.
> Fillister is the shape of the head, tall like a Rochester carburetor
> screw or a "cheese head" screw.
> The hourglass drive is a "clutch head" design.
> Commonly found on the interior sheet metal of a Corvair 95. And
> inside the Powerglide.
> Frank DuVal
> On 1/1/2020 3:35 PM, Smitty via VirtualVairs wrote:
>> Ole weak eyes. Closer examination of the fasteners holding the fan
>> switch into the heater controller showed that they were Fillister head
>> fasteners. You know the ones with the hour glass drive in the head.
>> Now we are talking my language. I got a piece of seat spring wire and
>> ground a tool to fit. The screws are out. Now all (ALL) I have to do
>> is fix the switch. Anybody been into one of these? Any advice.
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