I have just spent four, very enjoyable days, at the Rollcutter Rendezvous.More of that later. My skeleton "Topsy" midi organ developed a loud mechanical tapping noise on some of the notes.The picture shows the problem !! Several of the solenoid buffer washers have been compressed to the point where they did not recover. Today they were all exchanged for washers made from a wool felt specially imported from France. At the moment they are on life test. They are much quieter and seem to be lasting very well.