I have been using Aerofly Pro Deluxe (and add-on 1) for some time now and love it! But my GameCommander USB controller is just about worn out. The elevator/aileron gimble is getting really bad. It no longer moves smoothly, and sometimes even binds up causing me to crash. The tension springs are also way too heavy (always have been). I know I can buy a new controller but don't want to spend $89. I would much rather just connect one of my own transmitters (Airtronics RDS8000 or Spektrum DX5e). What kind of interface cable do I need for this, and where can I get it?