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Can't get my head around what you're trying to do (picture?)
But would this help?
https://www.tritoncycles.co.uk/components-c9/headsets-c79/trek-knock-block-1-1-8-lockring-spacer-p19463Edit: Sorry, I read '28.6' instead of '26.8'
I can try but essentially a heavy 26.8mm steel rod that needs to be held