If I remember correctly, Futaba had a "Dial-A-Channel" module for module type tx's. If they are still available you may want to consider that. I have a 9CAP and really like it. Hitec also has a "Dial-A-Channel" module that will fit the Futaba but it also falls under them same as changing the tx crystal, a BIG NO-NO. Also watch changing crystals in Futaba 72mhz rx's as they have a low and high channel numbers. Rx's are tuned for ch 10 to 34(?) and 35 to 60. I think that's the change point. Check around your area, lots of Futaba tx's had these modules. You just may be able to find the one you need at a really good price.