My Diehl nose wheel has developed a violent shimmy between 20 and 40 Kts. I managed to drip some oil from the engine onto the strut. The oil ran down and got into the swivel joint and lubricated the nylon washer. Now it does not have the proper friction. So, have to take the swivel joint apart, clean off the oil and re-adjust the friction upon reassembly. This KR might be turning into a ford.
Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA