My apologies guys as I passed on some bad information about the Matchbox from JR. I always try to verify info before I repeat it but I dropped the ball on this one. The Matchbox works with ALL JR SERVOS, BOTH ANALOG AND DIGITAL. I got bad info from some pretty reliable flyers but we were all wrong. I had one in my goody pile waiting for another project so I went to the shop and just spent an hour checking it out. My advice on setting them up is to get things fairly close by using the radio travel adjustment and linkage setups as the changes with the Matchbox are not infinite but certainly sufficient for final adjustments. As an aside for future projects, I'm using Multiplex servos for my P-38 flaps as they are infinitely adjustable plus you can adjust the speed. The slowest speed will be a perfect flap speed so all I have to do is flip the switch and forget it. I prefer JR servos but I'm eperimenting with these and although not as strong as JR's, they have great holding power and have workd fine in a 35% 540