Lads, whenever I need a certain sized driver I consider it expendable and grind it to fit the slots. German guns have notoriously thin slots so I might use the driver only once. A better way of going about it is to buy oil hardening drill rod (Cheap from Enco.com) and form your own bits with the belt sander or Dremel Moto-Tool. Heat treat them once ground to proper shape by heating cherry red with a propane torch and quenching in any kind of oil (I use drain oil from my car). Draw the temper to a straw color or light brown, requench and you are set. Keep a bunch of such bits near your drill press where you can chuck them up and hand turn the subject screw out by using the quill feed. A cheap, easy way to make a bunch of unique bits. Chopperlump
