Fred McKenzie wrote:
I've heard of Posidrive. I think they are used in an old Hewlett Packard
counter I have. However, the tool dealers I asked had never heard of
them. I ended up using a common Phillips driver for my counter.

Certainly Posidrive would be a better choice where they are more commonly used.

I'd consider looking for some other tool dealers to do business with.
Pozidriv (a registered trademark of Phillips Screw Co.) screws and
drivers are very common, sold by just about every tool company from
Snap-on through Stanley to Sears.

Tektronix used Pozidriv screws exclusively for many years, until they
converted over to Torx. A standard Phillips bit fits poorly in a
Pozidriv screw, making it really easy to chew up the screw with this
combination. Any decent toolbox should include some Pozidriv drivers or
bits.

Roy Lewallen, W7EL