I think the original post has nothing to do with the shaft. On my TI I never tripped the Click and Go because the latches sit lower in the hull. When I first got the AI I had a lot of problems tripping the latches with my big feet. The worst part is when one side would release, I would not notice and keep pedaling, the latch would lock with the shaft out jamming the drive on a angle. I had a lot of problems releasing the drive.
I modified the latch covers so they do not jam against the drive hex bolt head. That prevents the jamming problem.
I have not come up with a good way to keep the big feet from tripping the latch. I changed my behavior and do not put my feet next to the drive. That has helped.
One idea that I will try is to glue some foam pads around the latches to protect them from accidental tripping...
2011 Adventure Island (Little Dog)
2010 Tandem Island (Big Dog: "We keep a leg up on the competition")
2001 Wilderness Systems Woodsman Kayak 14.5 (Blue Dog)http://dogslifeadventures.blogspot.com/