Can someone support a refute a notion I have in my that the actual Robertson
screw socket is in fact not identical to the square drive screw sockets we have
available to day in the USA?  Somewhere in the dusty corners of my brain I have
a recollection of reading a discussion of this that pointed out that the USA
square drive socket is less precise than the actual Robertson.  Thus, the USA
square might not actually “stick” on the end of the driver.

—Scott

On Feb 20, 2019, at 1:20 AM, Marvin Paisner mailto:paisners@s...">mailto:paisners@s...>> wrote:

Robertson screws required one less step to manufacture as no slot had to be cut
after the head was formed, the head shaping and tapering square socket were
stamped on the same machine stroke.  The result being Robertson screws cost less
to manufacture. However P.L. was able to sell them for more than a slot screw by
demonstrating that the Robertson screw when set on the tip of his screwdriver
would stay in place, even if you pointed the driver holding the screw to the
ground.   Robertson was a good salesman.


---------------------------------------------------
Scott Stager
Columbia MO
573-474-5955 home
573-424-4764 cell
stagers@m...<mailto:stagers@m...>