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<DIV>Here is the real story of the Pozi and Phillips Screws as they say it came
right from the horses mouth. In 1996 my father interviewed the Phillips family
the designer of the Phillips and Pozi Screws. They personally approved this
article that my father wrote on the Phillips Screw the Austin Healey Magazine.
This and many other articles are in our Healey Tech Talk Book.</DIV>
<DIV> </DIV>
<DIV>The bottom line is the Phillips Screw is designed to slip out at a pre
dertimined torque, and the Pozi Screw is designed to not slip out. </DIV>
<DIV> </DIV>
<DIV>And the Pozi Screw was developed in about 1956 for the automotive industry
so there is no way that they could have been installed on a BN1. </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Century'; COLOR: #000000">
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Century'; COLOR: #000000">David
Nock<BR>British Car Specialists<BR>209-948-8767<BR><A
href="http://www.britishcarspecialists.com">www.britishcarspecialists.com</A></DIV>
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style="FONT-SIZE: 12pt; FONT-FAMILY: 'Century'; COLOR: #000000"> </DIV><BR></DIV>
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style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
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<DIV> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A
title=healeys@autox.team.net>Henry G Leach via Healeys</A> </DIV>
<DIV><B>Sent:</B> Monday, March 22, 2021 9:47 AM</DIV>
<DIV><B>To:</B> <A title=bspidell@comcast.net>'Bob Spidell'</A> </DIV>
<DIV><B>Cc:</B> <A title=healeys@autox.team.net>'Healey List'</A> </DIV>
<DIV><B>Subject:</B> Re: [Healeys] BN2 screw in the center of the
dash</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>Guys-pozidriv
screws were used on the later 3000, etc. as a production item. This type of
screw was used with a special tool to "quickly" install screws on the line. It
was another way BMC was trying to make a buck on underpriced and over-difficult
assembly of vehicles. Then they went broke...Hank<BR><BR>
<DIV class=reply-new-signature></DIV>
<P>-----------------------------------------</P>From: "Bob Spidell" <BSPIDELL
@COMCAST.NET><BR>To: "Curtis Arndt"<BR>Cc: "Healey List"<BR>Sent: Monday March
22 2021 9:01:24AM<BR>Subject: Re: [Healeys] BN2 screw in the center of the
dash<BR><BR>Thanks for the correction, Curt. I'd always wondered why 'posidrive'
screws were used--I think posidrive is a relatively recent development--and why
regular phillips drivers worked in them (I think posidrive has a steeper angle
of the screw blades). I have a posidrive screwdriver, but I usually grabbed
whatever was handy. Do you know of a source for the correctly marked
screws?<BR><BR>Do you know if the backing flat washer was tapped (I don't think
so, but I'm not sure). IIRC there is a tapped plate that binds the
screws--again, chromed--that attach the rearview mirror.<BR><BR>Bob<BR><BR><BR>
<DIV class=moz-cite-prefix>On 3/22/2021 7:59 AM, Curtis Arndt wrote:<BR></DIV>
<BLOCKQUOTE>
<DIV dir=ltr>Hi Bob and Joe,
<DIV> </DIV>
<DIV>Just a quick correction, "Pozidriv " screws were never used on AH 100s,
BN1/2s. </DIV>
<DIV> </DIV>
<DIV>The four marks on the head of these 10-32 screws were there to denote UNF
from "Whitworth" during the changeover to the Unified screw thread forms in
the 1950s.</DIV>
<DIV> </DIV>
<DIV>I've attached a page from my vintage Machinery's Handbook which
illustrates this fact.</DIV>
<DIV> </DIV>
<DIV>Cheers,</DIV>
<DIV> </DIV>
<DIV>Curt</DIV></DIV>
<DIV> </DIV>
<DIV class=gmail_quote>
<DIV class=gmail_attr dir=ltr>On Sun, Mar 21, 2021 at 11:27 PM Bob Spidell
<<A>bspidell@comcast.net</A>> wrote:<BR></DIV>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0px 0px 0px 0.8ex">
<DIV>I neglected to mention the screw is backed-up with a large, extra thick
flat washer (because of the large hole in the bracket). It's unique because
it's as thick as a couple of typical flat washers and <I>might--</I>I don't
recall for sure--be tapped for the screw.<BR><BR>
<DIV>On 3/21/2021 10:21 PM, Bob Spidell wrote:<BR></DIV>
<BLOCKQUOTE>Yep. And, the original screw is chromed posidriv, with a
slightly oversized--the screw is a #10 IIRC--chrome washer. I noted this
when we tore down our BN2 for restoration, and promised myself I'd not
lose these. I lost them (and have never found proper
replacements).<BR><BR>You can sorta see them in this grainy photo (I
<I>shoulda</I> took more).<BR><BR>Bob<BR><BR>
<DIV>On 3/21/2021 4:14 PM, Joseph Costa wrote:<BR></DIV>
<BLOCKQUOTE>
<DIV dir=ltr>Does it just attach to the brace behind the dash?
<DIV> </DIV>
<DIV>Joe </DIV>
<DIV>BN1 #923</DIV>
<DIV>BN2 100M</DIV>
<DIV>BJ8 Blue
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