Ok..bored on lockdown so here we go!
Around 2008 or so I did a run of knurled ANH belt box knobs with Vadermonkey for some of our friends.
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The fact that they are knurled and come from the Michell turntable is now widely known and accepted.
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In doing research on the knobs I noticed it appeared to me that the top inner knob on the left belt box was shorter than the rest. At first I thought that knob was the smaller one on the turntable, but I recently learned the diameter is different ruling that part out.
My only other thought centers around the red washers. I have heard from a reliable source that those red washers are not metal, but some type of rubber material.
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I am thinking that tightening the knob a bit too much may squish the washer and allow the knob to appear shorter. On the attached pic of Ellers recently sold belt you can see the short knob..and the washer under it looks different to me, but maybe I’m seeing things. Thoughts?