It's going to be hard to help you with this without actually having it in our hands. Perhaps a video of you attempting it may help?
Even then, I would just be patient and keep trying until you figure out what's stopping the MB from going in. At this point, there must be something physically blocking it, right? You just got to be patient and try and spot it out.
I've never really had problems inserting a MB into the gearbox, except when:
- I installed thicker wires into a small body / not using default wire routing
- I forgot the bolt catch was there (SCAR)
- I installed something in the wrong order (something outside of the MB that was supposed to be installed after it's been inserted into the lower)
That's all I can think of right now...
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