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    Hi Teige,<br>
    <br>
        We had a similar situation before. It was caused by collision
    between the shutter and one of the grid-holding arms, which was
    slightly floating from the tip plate.<br>
    It happens when the arms get worn out over time and lose elasticity.
    It may also be caused by slight bent at the holder's tip.<br>
    Eventually, we asked Gatan engineers to fix the arm. I hope this
    information helps you.<br>
    <br>
    Best,<br>
    <br>
    Toshiyuki Oda<br>
    <br>
    <div class="moz-cite-prefix">On 2018/08/10 22:44, Matthews-Palmer,
      Teige Rowan Seal wrote:<br>
    </div>
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      cite="mid:9FC7E9FC-6B33-48BE-9E0C-2A9840065853@ic.ac.uk">
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      Dear 3DEMers,
      <div class=""><br class="">
      </div>
      <div class="">While troubleshooting some “leopard print” ice
        contamination on a Gatan 914 holder, we noticed that the <b
          class="">underside</b> of the cryoshield/shutter does not
        close 'all the way' (you can see the grid).</div>
      <div class="">I wanted to know from other users of 914 holders,
        does the underside of your shutter look like this when closed,
        or does it slide further to completely seal away the grid?</div>
      <div class=""><br class="">
      </div>
      <div class="">An alternative cause of the contamination is a leak
        through the shutter rod assembly.</div>
      <div class="">Any thoughts welcome!</div>
      <div class="">Thanks,</div>
      <div class="">Teige</div>
      <div class=""><br class="">
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      <pre wrap="">_______________________________________________
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</pre>
    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">-- 
-------------------------------------------------------
Toshiyuki Oda Ph.D.
Professor
Department of Anatomy and Structural Biology, 
Graduate School of Medicine
University of Yamanashi
1110 Shimokato, Chuo, Yamanashi JAPAN 409-3898
Phone:+81-55-273-6743 <a class="moz-txt-link-abbreviated" href="mailto:email:toda@yamanashi.ac.jp">email:toda@yamanashi.ac.jp</a>
------------------------------------------------------- </pre>
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