A very big public thank you to Grantlee Kieza for providing a copy of the elusive Italian Document which documents the cause of the crash of Puss Moth CF-APK.
This ends my 30 year plus search for a copy of the document involving enquiries in Italy, the UK, Canada and Australia.
The document states that the wing seperated from the fuselage in flight in part due to a defect in soldering which resulted in the breaking of a bolt slot which allowed progressive play in the wing joint. This eventually resulted in the wing breaking away.
The seperated wing was found 250 metres / 820 feet from the main wreckage.
Thank you again to Grantlee. Make sure you buy a copy of his book on Bert Hinkler. Thank you also to those on this forum who helped me in my quest.
I think we can categorically say that the propeller of CF-APK was not tampered with and the aircraft did not collide with a tree while attempting an emergency landing.
Rest in Peace Bert Hinkler and Godspeed.