If it is a Regina America Superleggera or nothing, then abandon C&V. There are alternatives in function, Everest for one, others like Suntour (the Ultra series) or the late Shimano DuraAce freewheels. Most bike shops way back were feign to repair a freewheel, today where spare cogs or internal spare parts are not readily orderable and there is little hope of a repair. If you are not flexible in your requirements, then sell it off and be happy with the Modern stuff.