Steve I have had the same problem. When I removed the Motor and Gear box I noticed that the bushing that support the shaft in the leg assy was loose. The E Clip was missing. Went to the local Auto Parts Store and got a new e clip and so far things work ok. I did notice also when I had the leg out that the upper gear had a chipped tooth. But landing gear works ok without the clunk. Leg is easy to remove. The Wolfer Wagon Rich and Effie.