Do you have a remote controlled model car shop near you? Might be worth a visist with your 'bits'
I repaired an Autohelm gear/belt with car parts, all the pitches and shaft sizes seemed standard, in fact, the motor in your pilot is the same as an electric RC model car!
Just order a new one from a Simrad dealer. they aren't very expensive. I replaced 2 on mine as they stretched and jumped cogs. I gave up on it after 2.