I think Delrin, also called Acetal, is the material of choice for the bushings.
http://www.aetnaplastics.com/products/d/Acetal I had a machine shop make up a selection of thicknesses from tube stock at a reasonable price - $80 for six pieces. I did take the rudder off, cleaned and checked it for straightness. I also cleaned out the rudder tube with a mild solvent and soap and water. I checked the diameters on the shaft and tube. Since I do not know what there were to start with it would be hard to say if there was any wear, but both are round and the same size top to bottom. From that I would guess there was little wear. I have not seen a spec of what the clearance should be between the rudder post and tube. Trying to get an exact measurement of the rudder tube would require a bit fancier stuff that I was using but my guess is that Windburn has about 1/32" clearance. After greasing everything with Lubriplate sliding the rudder back in required a solid push. I replaced both the top and bottom bushings, left a very small clearance. While on the hard I cannot feel any play in any direction. The rudder swings freely, either from the wheel or from the rudder. Michael Brown Windburn C&C 30-1
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