Interesting to note the ET 503 bomb racks, which were produced by Focke Wulf and were originally designed for an underwing installation, so to fit them under the Me 262's nose, a wooden base plate contoured to fit the curved top side of the rack was made. These were hand made and their quality was not always guaranteed. The other problem is that these racks instilled severe vibration in the aircraft in flight. This was cured by the fitting of the Wikingershiff bomb racks specifically designed by Messerschmitt for the Me 262.