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Finally got these Delrin spacers made.  I went with the same design as my previous aluminum spacers but beefed up the walls a bit to compensate for the lower strength of the material.
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3.7g for the 10mm 2.1g for the 5mm, that’s lighter than carbon!  There will be a 20mm piece coming soon.
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I’ve spec’ed them to fit over the steerer tube very snug which should increase the strength of the system.  The finish of the 10mm pieces seem to be smoother than the 5mm pieces.  I shall test them out after which they will be available for mass consumption.