> -----Original Message-----
> From: Bob Nelson [mailto:reeinelson@w...]
> 
> The screwdriver shown in that picture isn't what is usually considered a
> true turnscrew in that the lower part of the shank is round vs. flat.
> 
> Using a screwdriver to check plug ignition was
> standard practice in those daays
>

Bob,

I don't know about that.
I doubt that there is a distinction based on a particular
blade configuration, "turnscrew" is just an old-fashioned
word for what we now call a scredriver. Weren't there various
"patterns" of these old screwdrivers? London, Cabinetmakers, etc?

I of course know about diagnostic and tuning procedures on
old cars, such as the flathead 6 shown in the old photo.
I did work as a mechanic for about five years. And have
worked on many engines with a mechanical disributor and even
a couple with a magneto (ie. Wisconson air-cooled V4).

I was just amused to see such use of a fine old wooden
handled turnscrew. I had an uncle who could stop an old
side valve inline six by placing a fingertip on each plug
and having his palms against the head casting. He could
short enough plugs to stop the engine and keep his hands
there till it stopped, must have been mad :-)

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