Questions
Does the sleeve gear moove at all with main bolt tightened.
Does the mainshaft moove at all with the bolt tightened.
I am probably stating the obvious but the gearbox components looked pretty good besides the obvious damage which has been corrected,ie the shafts have good support at both ends and the kicker will be back on line.
If the box was OK before it was dismantled it shouldn't do an about face when its put back together.
If the problem doesn't present itself after considered analysis and NickZ is really stuck, the step by step approach as a last resort perhaps may see him clear.
For example firstly insert the sleeve gear and mainshaft and the supporting cover at the other end of coarse and then tighten the bolt. If Ok then add the coponents in a logical order untill the snag presents itself.
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Ive had the same stator problem as outlined above and after attempting to splice the two wire back together ended up just buying a new one.Not what I called an easy job as there wasn't anything to play with. Didn't know what to do about it.
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Hope I have the posting format right this time.