drill size

Hello, Does someone here have a technical drawing they are willing to share of their custom Bock #6 section, that accepts the Bock #6 nib housing? I know I should drill with a 7.3mm drill bit for the housing thread, and probably with a little smaller diameter bit through the entire section, so...

I am making a pen for a customer that requires 10.5mm and .492" bits. Don't know how I missed it but I don't have those sizes (usually i forget to buy bushings). What I did notice was that the tubes fit in 13/32 and 31/64 inch holes. They are a little snug but can still be inserted with 2...

Im getting ready to do some kitless pens using Lou's taps. What are the ideal drill sizes to use with then? I searched the forums and Lou's website. Cant seem to find the info. Any suggestions would be helpfull. Looking forward to getting the dies. Thanks, Tim