I finally have a source for custom made Spinning Wheel Flyer Mandrels and am offering them for sale. Made of steel with a through yarn exit hole and proper left hand threads.
All that is required is the measurement between the bearings on the maidens and it will be fabricated to those specifications. The metal mandrels are the most difficult part of the wheel to find, usually the flyer, mandrel, whorl and bobbin are missing. The wooden parts I have no trouble making and now I can have these made for my own restoration work and to offer for sale at the Full Chisel Store.