Just thinking aloud ......
I would think just a single line and clip to the bow and stern would be easier than a strap/sling you have to get around the kayak in the water to lift it back up.
To what, on the bow and stern, do you envision clipping the single lines to? I was actually thinking of doing exactly that but could figure out the attachment points on the kayak.
I had thought about the carrying handles, but not sure if that's a strong enough anchoring point.
At least temporarily, for today's test run I went with the sling idea.
I managed to get the davit installed today. Sucker was heavy...
I wound up putting some 2x8 PT under the existing stringers. Through bolted the whole thing and used some SS screws to shore up every 10 inches.
It worked like a charm
On the bow side I passed a cargo strap through the pedal opening and under. That worked fine. On the rear, it was harder to find the balancing point. That's why I think your idea is better. I just need to figure out where to connect.
I found 2" galvanized pipe that is strong enough and light enough. I don't know how to drill through round pipe in perfect alignment. I've got a drill press but need to think that through.
The nice thing about the sling is that I don't have to buy any extra parts. Everything you see came with the davit.....paid $100 for it.
So now, I can launch and sail the bay with relative ease...
Thanks for all the ideas!