<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Why not put captive nuts in the K&N’s and use Allen screws through the flanges of the carbs. Overcomes the spanner access issues.<br><br><div id="AppleMailSignature" dir="ltr">Alan - from my iPad</div><div dir="ltr"><br>On 22 Nov 2018, at 16:04, Michael Salter <<a href="mailto:michael.salter@gmail.com">michael.salter@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><div dir="auto">Just remember that if you or anyone else decides to revert to original filters it may be difficult to position them correctly <div dir="auto">.</div><div dir="auto"><br></div><div dir="auto">M</div></div><br><div class="gmail_quote"><div dir="ltr">On Thu, Nov 22, 2018, 10:50 AM Kees Oudesluijs <<a href="mailto:coudesluijs@chello.nl">coudesluijs@chello.nl</a> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  
    
  
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    <p>That thread is way to large to use, that would be equivalent to
      M10. The normal size would be M6 or about 1/4". <br>
    </p>
    <p>Kees Oudesluijs</p>
    <p><br>
    </p>
    <p><br>
    </p>
    <div class="m_-5243863183666024240moz-cite-prefix">Op 22-11-2018 om 15:15 schreef
      <a class="m_-5243863183666024240moz-txt-link-abbreviated" href="mailto:simon.lachlan@alexarevel.plus.com" target="_blank" rel="noreferrer">simon.lachlan@alexarevel.plus.com</a>:<br>
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        <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).<u></u><u></u></p>
        <p class="MsoNormal">So, it struck me that I may give my 3 HD6s
          another go. Swap them with the current setup.<u></u><u></u></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.<u></u><u></u></p>
        <p class="MsoNormal">I thought that I might put in helicoils
          then I thought “Why not tap the holes?”<u></u><u></u></p>
        <p class="MsoNormal">The holes on my HD6s are 11/32” or 8.8mm.<u></u><u></u></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.<u></u><u></u></p>
        <p class="MsoNormal">Any input would be much appreciated.<u></u><u></u></p>
        <p class="MsoNormal">Thanks,<u></u><u></u></p>
        <p class="MsoNormal">Simon<u></u><u></u></p>
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