The Tower radio is in fact the old Futaba Conquest and yes its a simple matter to do the spring change to acheive mode one but as I described above you will end up with crossed trims, the throttle and elevators trims end up next to the wrong stick. What Tower means is they do not do a proper changeover and it is not cost effective. It is a big job.

Most flyers in North america fly Mode 11 which means as Dave Segal has said you will have difficulty getting an instructor or any other help and consider this, resale value of your radio is almost nil since there is such a small market for mode 1

Most folks that do make a changeover successfully will resort to there prior mode during a time of stress and that not healthy for airplanes.

Your are not gonna miss anything, stop fussing get your mode 11 equipment and get going!

John