[Healeys] BN2 screw in the center of the dash

[gradea1 at charter.net]

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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