TXLATX I think the term you are refering to is beading older aircraft have a lot of beaded pipes in the fuel, oil, and pnuematic systems, you used to be able to buy kits to do this back in the day but I havent seen one in a long time! here is something that might be of interest.
http://www.roadraceengineering.com/eclipsetech/icpipebead.htm


DS