Yes I know all of this, I was asking questions I already knew. If you notice in my first post I had a link that covers all this in detail. I was trying to point out there are other ways than getting a demo letter. Then you stated " you will have to actually make your conversion device" I was just trying to point out what you said above about "finishing them". I was not saying there was anything wrong with buying 80% kit. Don't forget ITAR. Edit: did you read post 14?