Jackcrafty you make a lot of sense, I have only got to handle couple of these arrows, the rest of my information has been from sources such as books, internet, museums etc. Thanks everyone for their input.
So here's another question, how were the lightning grooves made? I've tried a piece of antler with a hole in it and a sharpened nail inserted so just the tip of the nail is sticking out inside the hole, I've also tried various utility knives, scrapers, flint and obsidian flakes, all have more less worked with varying degrees of success.
The bowyers bible says that if the grooves are made while the shaft is still green they will keep the shaft straighter while drying, I have not tested this but plan to in the next couple days. Thanks, have a good one, Duck