The top Seat bar joint E-E Has two cast mounts that fit into the back of the seat, there is a steel ring fitted inside the the larger hole of the mounts that fits on the top bar, this then fits onto a cast bronze bush that slides over the tube, that is then held buy a split pin, I think there is also another steel ring. At the ends of the tube are two machined steel plugs/bushes that are threaded they go into the the tube each end. The bottom seat bar FC-FC there is a larger cast seat mounting on the one side that attaches the seat and the ajuster handle the other side, there are also cast bronze bushes fitted into the end of the tube that butt up to joint FC with the inner tube going into the actual joint. not sure on the actuall bolts that hold the seat to the bottom mount or ajuster handle.

All very complex, but thats a Hurricane for you!

Ant.