My CX2 started making some clicking noises and soon after the upper rotor stopped turning. I took it apart a little and noted that the main gears were a bit stripped. The odd thing I saw, though was that the stripping was only partially across each tooth. The pinions are not engaging the main gears properly, so a lot of partial tooth stripping is occurring. I bought some replacement main gears and took everything apart (Jeez! Those little screws were frustrating to loosen up).

Unfortunately, the new gears don't look like they're lining up with the pinions any better than the old ones. It *looks* like I need some extra spacing to put a little more distance between the gears and the fuselage. As it is, the outer shaft gear isn't even half covered by the pinion gear. Then the inner shaft gear is halfway on the outer shaft's pinion gear and halfway on the inner shaft's pinion gear. It's not going anywhere unless part of it starts stripping.

I don't think I've knocked the motors out of alignment or damaged the frame in a way that would explain this problem.

Looking at the schematic, it doesn't seem that I'm missing any parts - and having seen the old gears, it looks like this problem was somewhat "congenital".

Any ideas?