The original rudder post bearing on Sirocco was more of a cap than a bearing.It had become egg shaped at the opening and could no longer keep out the water under power.I had a machinist friend make a new one from the drawing in the manual.It `s alot better than the original one with probabley 4 or 5 times the bearing surface area.The old one fit over the post and the new one as in the manuel drawing fits down into the post.IT `s a simple job to do about 1/2 an hour at best.