Thanks Duane. That helps.

Richard

Duane Bozarth wrote:
Dorothy and Richard Shelson wrote:

Sorry to come in from left field but I need to ask. What IS a "posi
screw"? We have in Canada a Robertson screw which I am told does not
exist in the US. I think it is far superior to the Phillips. Is that
what you are referring to?


Pozidrive is another variation of a cross-slot head somewhat similar to
a Phillips..

A Robertson certainly can be obtained in the US altho the "square-head"
moniker is more common. There can be a slight difference in cam angle
of various variations.