We had to wait a long time to get our Osmose planes and the reason given was that they had production problems they had to solve. Looks like that the older fuses had a bad surface. All I can say is that the new ones are very smooth and superb quality.
Wolfgang, your supplier should take the plane back and pay for the transport, or just ship you a new fuse. I know I would.
Peter
Cerebus RC
www.cerebus.co.za