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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 type="cite"
cite="mid:CAJKrNeSazKxDgqTgh+SLJomJjnEsPnYV_KeveT6Rt-WBtmmMyg@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<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 href="mailto:bspidell@comcast.net"
moz-do-not-send="true">bspidell@comcast.net</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;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 type="cite"> 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 type="cite">
<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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