Problem with Norton Oldtimers is they sometimes tell stories to entertain their audience rather than to give factual information. I know a few of these storytellers.
The press tools for the petrol tanks were in Britain and existed in about 1985 when I remember it was seriously discussed at Norton Motors in Shenstone- but not done for cost reasons- to re-manufacture Interstate tanks. So much for some Indians whacking tanks out of empty Baked Beans tins in the back of a house in an Indian slum.....
The story with the piece of wood I have also heard many times. It is always a different factory, always a different machining operation, but always that elusive piece of wood.
Folklore is nice but should not be mistaken for historic facts.
Joe/Andover Norton