I have used Vesconite for both the top and bottom bushes for my Hanse 301. I spoke to some very knowledgeable people in South Africa and, unfortunately, the size of tube I required was not held in UK, so it was sent, and with it instructions on how to machine the material. I followed those and machined my own bushes in the farm workshop, then went to the boat and offered them in… perfect fit, both into the hull and in the cockpit… was a perfect fit for the rudder tube. It was a great material to work with.