I found a book in Pops stuff that is made up of letters from the Indian factory to dealers called "contact points" from the mid 1930's to 46 or so. Some are interesting like shipping bikes without headlights, to asking dealers if they should build the "45", or asking dealers to look for sheet steel they can make fenders and tanks due to shortages. I sent in a digital copy here so everyone could read them but I have not been able to find them. It is fun to read this old stuff.