I wanted to put blocks inside the boat between the seat and the deck where I had only a bolt and lockniys before, just to relieve any strain on the deck.
Something very stiff was needed but with a tiny bit of flex, something that wouldn't corrode. Blocks of wood were considered and high density foam but these didn't quite fit the bill, metal was right out.
Then it came to me, plastic pipe. I found a length in the shed and it was a perfect fit.
I had toyed with the idea of fitting a longer piece so that I could add mat to make thigh pads but it would have been a job getting enough padding on and being able to fit it between the pipe and the side of the boat.
I'm going to get thinner pipe, make up some hip pads then slide it into the pipe I have fitted, make adjustments then glue or screw into place.
I also added a foam block behind the seat for more stability.
And for good measure a big one under the front of the seat.
Now if that isn't stable I'm going to have to weld in a metal one !