Now looking more closely at the picture at http://www.mikrobrau-berlin.de/shop_neu_2005/ a simplified (at least two CO2 tanks needless)procedure for the transfer comes to my mind:
- to measure a head pressure with a gauge at a source keg;
- to pressurize the target keg for a pressure 0.3-0.5 bar (5-7 psi) less than the source keg;
- to make transfer with a pressure equal to the head pressure of the source keg.
Does this approach look like having sense? Should the transfer line restriction be taken into consideration?