Hi! I had new tires installed recently on my 2002 Land Yacht. The grease monkey turned the the cranking mecanism for the spare tire the wrong way. The cranking sytem is now totally jammed

. I need a new assembly, the system is sealed and cannot be opened. The apparatus is operated from the rear luggage compartment and is about 16 inches long - center to center - between the nut on top and the tube that goes down with the braket under the Moho.
Anybody can help me as to where I can get this cranking system?
Thanks,
Remi
2002 Land Yacht 30, 2006 Vibe dinghy and 2004 Miata (toy).