[Healeys] BN2 screw in the center of the dash

gradea1 at charter.net gradea1 at charter.net
Mon Mar 22 22:02:17 MDT 2021 

That was what I really appreciated about Norman. He was so exacting,
knowledgeable, and took the time to research and answer any question
related to British car maintainence.
He is revered as a legend for solving issues with British cars. Sure
miss him. Excellent article. Hank

	-----------------------------------------From: "David Nock BCS" 
To: "Bob Spidell"
Cc: "Healey List"
Sent: Monday March 22 2021 10:21:16AM
Subject: Re: [Healeys] BN2 screw in the center of the dash

   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.   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.   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.      David Nock
 British Car Specialists
 209-948-8767
www.britishcarspecialists.com [1]   
      FROM: Henry G Leach via Healeys SENT: Monday, March 22, 2021
9:47 AM TO: 'Bob Spidell' CC: 'Healey List' SUBJECT: Re: [Healeys] BN2
screw in the center of the dash       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

	----------------------------------------- From: "Bob Spidell"
 To: "Curtis Arndt"
 Cc: "Healey List"
 Sent: Monday March 22 2021 9:01:24AM
 Subject: Re: [Healeys] BN2 screw in the center of the dash

 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?

 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.

 Bob

On 3/22/2021 7:59 AM, Curtis Arndt wrote:
  Hi Bob and Joe,   Just a quick correction, "Pozidriv " screws were
never used on AH 100s, BN1/2s.    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.   I've
attached a page from my vintage Machinery's Handbook which illustrates
this fact.   Cheers,   Curt     On Sun, Mar 21, 2021 at 11:27 PM Bob
Spidell  wrote:
  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
_might--_I don't recall for sure--be tapped for the screw.

On 3/21/2021 10:21 PM, Bob Spidell wrote:
 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).

 You can sorta see them in this grainy photo (I _shoulda_ took more).

 Bob

On 3/21/2021 4:14 PM, Joseph Costa wrote:
  Does it just attach to the brace behind the dash?   Joe BN1 #923 BN2
100M BJ8 Blue Baby  

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