Hi Jon,
Something I had missed on first read; your solution uses a pin instead of nut&bolt – therefore it would be an improvement on mine since it could serve a dual purpose pin and do away with fiddly nut..
Given that I need a pin anyway for holding rudder “horizontal” in the pen when manouvring on launching trolley, I could use same pin for holding tiller in place when sailing using your technique.
Final question – Is the hole straight thru top and bottom of the “tube” ?
Many thanks !