I second what Charlie said, the mod is very involved (read expensive) , you need a foolproof method that works for you. When I had a 20, I used a red flag hooked to a 1" plastic tube that I shoved over the elevator push-rod. The flag read, "7 pins connected". As I hooked up the last one (elevator) I removed the flag and put it on the elevator rack in the trailer. When the ship was disassembled next, the flag was there, hanging from the trailer rack, to remind me to take it back to the elevator pushrod. This worked for me, the flag migrated back and forth, always a reminder to hook everything up AND cock the system for the next assembly or disassembly. Figure out a system that will work for you and follow it religiously.
JJ