"RickMerrill" <Rick0.merrill@gmail.NOSPAM.com> wrote in message
news:gkqmig$hvh$1@news.motzarella.org...

> ROBERTSON screw heads are several, but basicly LOOK like a Phillips

RM is mistaken.   Robertson screw heads are incised with a square
socket for the screwdriver.  (Robertson screwdrivers come in four
sizes, none small enough for use in computer components.)  Phillips
screw heads fit a cross-shaped screwdriver tip (designed to slip
out if excessive torque is applied.   Designed for use in wood,
Robertson screws aim at the opposite, the bit not slipping.)

-- 
Don Phillipson
Carlsbad Springs
(Ottawa, Canada)