<html><body>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><br></div>
<div>Just a quick correction, "Pozidriv " screws were never used on
AH 100s, BN1/2s. </div>
<div><br></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><br></div>
<div>I've attached a page from my vintage Machinery's Handbook
which illustrates this fact.</div>
<div><br></div>
<div>Cheers,</div>
<div><br></div>
<div>Curt</div>
</div>
<br><div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Mar 21, 2021 at 11:27 PM
Bob Spidell <<a>bspidell@comcast.net</a>>
wrote:<br></div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px .8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<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><br></div>
<div>Joe </div>
<div>BN1 #923</div>
<div>BN2 100M</div>
<div>BJ8 Blue Baby</div>
</div>
<br></blockquote>
<br><br>
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