Just finished mounting a new boat seat and swivel base to my PA seat frame. Total investment: $60.
I'll probably end up moving the steering handle bracket to the mount to the PA seat frame rather than the seat bottom. That way it won't restrict the degree of swivel movement. I want to mount the assembly back on the PA first and check it out before I make that change. I'll do that the next time I go up to my vacation home where I store my PA - after X-mas.
Unfortunately it will be a while until I get to test it out... Hmmm... Maybe I need to do some winter trout fishing in some of the the Central CA reservoirs - just to give it a shake down...