The threaded portion of my "thunk" fits nicely inside this spacer
Date: 12/13/2013
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dscn0544
Date: 12/31/1969
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EAA SITE
Date: 08/23/2023
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EAA SITE
Date: 08/23/2023
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DSCN5113
TCP - Highly recommended if you run 100LL for more than 30% of your fuel usage. Nasty stuff. Lots of warnings. Can't legally carry it on the aircraft with you. ACS carries Decalin TCP. It MAY be a suitable and transportable substitute, but it's not currently approved by Rotax.