On Tue, 16 May 2017 18:44:53 +0100, Graeme
wrote:
snip

Does anyone know
whether Pozi heads are the same? I don't want to buy, then find the
head of the drive is similar, but not quite the same.


The text on this page seems to state that the SUPADRIV was an
improvement on the Pozi.

https://www.google.com/patents/US4464957

Good comparison picture of the two heads at stage 14 he-

http://www.instructables.com/id/When...ot-a-Phillips/