Not a Air Knocker but better. I have a 1939 BC-65 Deluxe Taylorcraft. It has the wings off to recover and 65 Continental is off and in my heated shop. It is complete including new spars and enough new ribs to replace damaged ones. Deluxe means it has fancy chrome trim on the cowl, two doors, and two fuel tanks. The trim was on the nose bowl was missing but I found some sand castings that are now polished and almost ready for mounting. However it is a project, as I bought from the owner A&P that has stored it for over 30 years in his hanger along with several other projects. Needs to be gone clear through and recovered.