There are posts on this site that show how to easily make a roller-furling system, for ideas even if it doesn't work for your setup.
Thanks, Craig. I'd found those, plus some vids on youtube about the same subject. I'm sure I'll be able to adapt something.
So the struts for the sidekick don't constrain your paddle stroke?
Only at the very end of the stroke (the release and takeout phases) if I'm careless and let it go as far back as when I'm paddling without the Sidekicks. But I have enough room to do a stroke with some power in it. I added the extensions because without'em the sponsons were right where my paddle blades wanted to be, reducing the swing room for each stroke.
A side benefit should be that the longer arms will be longer levers, giving me more "righting moment" and resistance to having the sponson forced underwater and/or the boat capsizing when sailing in stronger winds.
Where was that launch site?
Vancouver, British Columbia, Canada. Hence my drysuit - we don't do winter here the way the rest of Canada does, but it's still too chill to swim unprotected.