What model receiver is it? R124H or R114H?

Mode switching is nothing more than swapping the J-connectors to the receiver, I believe. When I put the 4-channel FM radio in the KT, I actually had to hook up servos to the receiver to figure out what stick went to what spot on the receiver. I then mapped them out on a sheet of paper.

Just out of curiosity, is the set screw on the flat portion of the motor shaft? Or does it stick out, even with it over the flat area?