ORIGINAL MESSAGE:

Roy Lewallen wrote:

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.



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The flutes on a Phillips bit are tapered; on a Pozidrive they are
parallel. In many cases you can use either bit on the other, but if
available, use the correct one.

A Phillips bit can "lever" itself out due to the taper, where a
Pozidrive will not.

Bill, W6WRT
ex Tektronix employee