refer to Alan's Hobby, Model & RC Web Links
http://homepages.ihug.co.nz/~atong/
" Servo & TX alterations, calculators, clonepacs, make an ESC or winch, FAQ." under "Radio Systems, Accessories, Alterations and FAQ"
e.g. "Futaba Skysport from 4 to 5 Ch. and Interface for PC"
or "expand Hitec Ranger 3ch to 7ch"
in need email direct for details.
regards
Alan T.