hi, i have a 30 year old 55mm screwmount lens. I know he dont make screw mount anymore and they only make adoptors for bayonet mout to screwmout so i have to get a used lens. I've looked at ebay and was wondering if ANY screwmount would fit on my fujica ST801? Or if anyone has any detailed steps on taking the lens apart and removing the fungus (im very mechanicaly skilled).