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Guys-pozidriv screws were used on the later 3000, etc. as a production=
=0Aitem. This type of screw was used with a special tool to "quickly"=0A=
install screws on the line. It was another way BMC was trying to make=0A=
a buck on underpriced and over-difficult assembly of vehicles. Then=0Ath=
ey went broke...Hank=0A=0A=09-----------------------------------------Fr=
om: "Bob Spidell" =0ATo: "Curtis Arndt"=0ACc: "Healey List"=0ASent: Mond=
ay March 22 2021 9:01:24AM=0ASubject: Re: [Healeys] BN2 screw in the cen=
ter of the dash=0A=0A Thanks for the correction, Curt. I'd always wonder=
ed why 'posidrive'=0Ascrews were used--I think posidrive is a relatively=
recent=0Adevelopment--and why regular phillips drivers worked in them (=
I think=0Aposidrive has a steeper angle of the screw blades). I have a p=
osidrive=0Ascrewdriver, but I usually grabbed whatever was handy. Do you=
know of=0Aa source for the correctly marked screws?=0A=0A Do you know i=
f the backing flat washer was tapped (I don't think so,=0Abut I'm not su=
re). IIRC there is a tapped plate that binds the=0Ascrews--again, chrome=
d--that attach the rearview mirror.=0A=0A Bob=0A=0AOn 3/22/2021 7:59 AM,=
Curtis Arndt wrote:=0A Hi Bob and Joe, =0A Just a quick correction, "P=
ozidriv " screws were never used on AH=0A100s, BN1/2s. =0A The four mar=
ks on the head of these 10-32 screws were there to denote=0AUNF from "Wh=
itworth" during the changeover to the Unified screw thread=0Aforms in th=
e 1950s. =0A I've attached a page from my vintage Machinery's Handbook w=
hich=0Aillustrates this fact. =0A Cheers, =0A Curt =0A On Sun, Mar 21,=
2021 at 11:27 PM Bob Spidell wrote:=0A I neglected to mention the scr=
ew is backed-up with a large, extra=0Athick flat washer (because of the=
large hole in the bracket). It's=0Aunique because it's as thick as a co=
uple of typical flat washers and=0A_might--_I don't recall for sure--be=
tapped for the screw.=0A=0AOn 3/21/2021 10:21 PM, Bob Spidell wrote:=0A=
Yep. And, the original screw is chromed posidriv, with a slightly=0Aove=
rsized--the screw is a #10 IIRC--chrome washer. I noted this when=0Awe t=
ore down our BN2 for restoration, and promised myself I'd not lose=0Athe=
se. I lost them (and have never found proper replacements).=0A=0A You ca=
n sorta see them in this grainy photo (I _shoulda_ took more).=0A=0A Bob=
=0A=0AOn 3/21/2021 4:14 PM, Joseph Costa wrote:=0A Does it just attach=
to the brace behind the dash? =0A Joe BN1 #923 BN2 100M BJ8 Blue Baby=
=0A=0A _______________________________________________=0A Support Team=
.Net [1] "_blank" moz-do-not-send=3D"true">=0A"http://www.team.net/dona=
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<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 "qu=
ickly" install screws on the line. It was another way BMC was trying to=
make a buck on underpriced and over-difficult assembly of vehicles. The=
n they went broke...Hank<br><br><div class=3D"reply-new-signature"></div=
><p>-----------------------------------------</p>From: "Bob Spidell" <bs=
pidell@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 t=
he center of the dash<br><br>=0AThanks for the correction, Curt. I'd alw=
ays wondered why=0A'posidrive' screws were used--I think posidrive is a=
relatively=0Arecent development--and why regular phillips drivers worke=
d in them=0A(I think posidrive has a steeper angle of the screw blades).=
I have=0Aa posidrive screwdriver, but I usually grabbed whatever was ha=
ndy.=0ADo you know of a source for the correctly marked screws?<br><br>=
=0ADo you know if the backing flat washer was tapped (I don't think=0Aso=
, but I'm not sure). IIRC there is a tapped plate that binds the=0Ascrew=
s--again, chromed--that attach the rearview mirror.<br><br>=0ABob<br><br=
><br><div class=3D"moz-cite-prefix">On 3/22/2021 7:59 AM, Curtis Arndt=
=0Awrote:<br></div>=0A<blockquote>=0A<div dir=3D"ltr">Hi Bob and Joe,=0A=
<div><br></div>=0A<div>Just a quick correction, "Pozidriv " screws were=
never used on=0AAH 100s, BN1/2s. </div>=0A<div><br></div>=0A=
<div>The four marks on the head of these 10-32 screws were there to=0Ade=
note UNF from "Whitworth" during the changeover to the=0AUnified sc=
rew thread forms in the 1950s.</div>=0A<div><br></div>=0A<div>I've attac=
hed a page from my vintage Machinery's Handbook=0Awhich illustrates this=
fact.</div>=0A<div><br></div>=0A<div>Cheers,</div>=0A<div><br></div>=0A=
<div>Curt</div>=0A</div>=0A<br><div class=3D"gmail_quote">=0A<div dir=3D=
"ltr" class=3D"gmail_attr">On Sun, Mar 21, 2021 at 11:27 PM=0ABob Spidel=
l <<a>bspidell@comcast.net</a>>=0Awrote:<br></div>=0A<blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px .8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex;">=0A<div>I neglected to mention t=
he screw is backed-up with a large,=0Aextra thick flat washer (because o=
f the large hole in the bracket).=0AIt's unique because it's as thick as=
a couple of typical flat=0Awashers and <i>might--</i>I don't recall for=
sure--be tapped for=0Athe screw.<br><br><div>On 3/21/2021 10:21 PM, Bob=
Spidell wrote:<br></div>=0A<blockquote>Yep. And, the original screw is=
chromed=0Aposidriv, with a slightly oversized--the screw is a #10=0AIIR=
C--chrome washer. I noted this when we tore down our BN2 for=0Arestorati=
on, and promised myself I'd not lose these. I lost them=0A(and have neve=
r found proper replacements).<br><br>=0AYou can sorta see them in this g=
rainy photo (I <i>shoulda</i> took=0Amore).<br><br>=0ABob<br><br><div>On=
3/21/2021 4:14 PM, Joseph Costa wrote:<br></div>=0A<blockquote>=0A<div=
dir=3D"ltr">Does it just attach to the brace behind the dash?=0A<div><b=
r></div>=0A<div>Joe </div>=0A<div>BN1 #923</div>=0A<div>BN2 100M</d=
iv>=0A<div>BJ8 Blue Baby</div>=0A</div>=0A<br></blockquote>=0A<br><br>=
=0A_______________________________________________<br>=0ASupport Team.Ne=
t <a href=3D"http://www.team.net/donate.html";></a>=0A"_blank" moz-do-not=
-send=3D"true"><a href=3D""></a>=0A"http://www.team.net/donate.html"=
target=3D<br>=0A"_blank">http://www.team.net/donate.html<br>=0ASugge=
sted annual donation $12.75<br><br>=0AArchive: <a href=3D"http://www.te=
am.net/pipermail/healeys"></a>=0A"_blank" moz-do-not-send=3D"true"><a=
href=3D""></a>=0A"http://www.team.net/pipermail/healeys"; target=3D<br>=
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br>=0A"true"><a href=3D"http://autox.team.net/archive";></a>=0A"_blank=
">http://autox.team.net/archive<br><br><a></a>=0Amoz-do-not-send=3D"t=
rue">Healeys@autox.team.net<br><a href=3D"http://autox.team.net/mailm=
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ttp://autox.team.net/mailman/options/healeys/bspidell@comcast.net<br><br=
></blockquote>=0A<br></div>=0A__________________________________________=
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br></bspidell@comcast.net></body></html>
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