<html>
<head>
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>I've not tried this, but my first thought is that the aluminium
bodies of the SUs would be too soft; eventually, you might strip
the threads (esp. if trying to get a good seal with the filter).
Why not do what you're likely to end up doing anyway: installing
thread inserts (Helicoil or similar). I think 5/16" bolts would
be sufficient.<br>
</p>
<p>Bob<br>
</p>
<div class="moz-cite-prefix">On 11/22/2018 6:15 AM,
<a class="moz-txt-link-abbreviated" href="mailto:simon.lachlan@alexarevel.plus.com">simon.lachlan@alexarevel.plus.com</a> wrote:<br>
</div>
<blockquote type="cite"
cite="mid:001701d4826d$c8fbd360$5af37a20$@alexarevel.plus.com">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
<meta name="Generator" content="Microsoft Word 15 (filtered
medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal">I’ll be removing my carbs soon in order to
achieve clearance for raising (the front of) the engine.
(Harmonic balancer installation).<o:p></o:p></p>
<p class="MsoNormal">So, it struck me that I may give my 3 HD6s
another go. Swap them with the current setup.<o:p></o:p></p>
<p class="MsoNormal">Thinking it through and looking at the big
box of bits, I recalled what a pain it is to get the nuts and
two washers onto the bolts that hold on the air filters. I
have French manufactured K&N lookalikes. The bolt starts
inside the filter, goes through the carb and gets two washers
and a nut. Very awkward to deal with those nuts and washers.
PITA.<o:p></o:p></p>
<p class="MsoNormal">I thought that I might put in helicoils
then I thought “Why not tap the holes?”<o:p></o:p></p>
<p class="MsoNormal">The holes on my HD6s are 11/32” or 8.8mm.<o:p></o:p></p>
<p class="MsoNormal">I am no engineer but it seems to me, from
looking at tables on Google, that I could use a 25/64” drill
bit and tap them out to 7/16”. I have both the drill and the
tap but would like some expertise applied to the issue before
I start drilling.<o:p></o:p></p>
<p class="MsoNormal">Any input would be much appreciated.<o:p></o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
</div>
<br>
<pre class="moz-quote-pre" wrap="">
</pre>
</blockquote>
</body>
</html>