So as it turns out, I hadn't installed the extensions properly - hence the flex & no response at the tips.
When I first put them on, I did it "top - down".
After some "observations", I removed them and re-installed them, this time "bottom - up".
This ensured a proper contact at the base of the paddle, so now I can trigger the gear change at the tips of the paddle extensions
woOot
It's not a solid "click", but we have contact.
Looks good now & does the job.
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