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    Hmm...<br>
    <br>
    Maybe try a donut rather than mess with the reflector optics.<br>
    <br>
    Patrick<br>
    <br>
    <div class="moz-cite-prefix">On 6/25/2015 9:40 AM, Steven Hood
      wrote:<br>
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      cite="mid:14e2af2f778.27f5.6f7d1c9102b81228b121511c9b3868d0@yahoo.com"
      type="cite">
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          <p style="margin: 0 0 1em 0; color: black;">From what the guys
            who've been
            doing the focus work tell me, it's been an issue with
            clearing the outer
            edges of the lens field. The lens support posts in the 36
            deg lens tubes
            are visible in the beam unless the Z is cranked way back.
            19s and 26s are
            fine.<br>
            Steven R Hood<br>
            310.756.3555<br>
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          <p style="color: black; font-size: 10pt; font-family: Arial,
            sans-serif; margin: 10pt 0;">On
            June 25, 2015 5:41:00 AM Patrick McCreary via Stagecraft
            <a class="moz-txt-link-rfc2396E" href="mailto:stagecraft@theatrical.net"><stagecraft@theatrical.net></a> wrote:</p>
          <blockquote type="cite" class="gmail_quote" style="margin: 0 0
            0 0.75ex; border-left: 1px solid #808080; padding-left:
            0.75ex;"> I learned somewhere some time ago that Kerosene
            was the recommended lubricant for machining aluminum;
            perhaps a drop or two on the offending part would help?<br>
            <br>
            What baffles me about the Z adjustment conjecture is that it
            seems to contradict what I know of ERS geometry - I would
            think that the Z adjustment is about positioning the
            filament in the focal point of the ellipse, and that the
            lens system optics wouldn't have any effect on that - maybe
            a slightly off batch of lamps?<br>
            <br>
            Patrick<br>
            <br>
            <div class="moz-cite-prefix">On 6/24/2015 6:21 PM, Steven
              Hood via Stagecraft wrote:<br>
            </div>
            <blockquote
              cite="mid:868532018.638952.1435184491035.JavaMail.yahoo@mail.yahoo.com"
              type="cite">
              <div style="color:#000; background-color:#fff;
                font-family:HelveticaNeue, Helvetica Neue, Helvetica,
                Arial, Lucida Grande, sans-serif;font-size:16px">
                <div id="yui_3_16_0_1_1435184224214_2358">Lighting
                  folks,</div>
                <div id="yui_3_16_0_1_1435184224214_2358"><br>
                </div>
                <div id="yui_3_16_0_1_1435184224214_2358">Have any of
                  you had an issue with the outer (XY) knob/nut seizing
                  the aluminum hub casting? We have... I've had to drill
                  out 3 of them this year - all from units that had been
                  assigned 36 degree lenses. It seems like that hub
                  casting is heating up more from having to pull the Z
                  adjustment so far into the reflector and seizing on
                  the outer nut as a result. Is there some way to
                  prevent that deformation?</div>
                <div id="yui_3_16_0_1_1435184224214_2358"><br>
                </div>
                <div id="yui_3_16_0_1_1435184224214_2358">TIA,</div>
                <div id="yui_3_16_0_1_1435184224214_2358">Steven R. Hood</div>
              </div>
              <br>
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              <br>
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