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I think that the nub on the inside of the right half of the mechbox shell isn't getting into the hole in the cylinder head.
The cylinder/cylinder head is being "lifted" at the back end by the spring tension (which is bowing the spring). That puts the head on an angle.
If you use a finger to push the cylinder down flat as you're closing it up...it might just pop into place (the satisfying "clunk" when the mechbox shell closes and everything is in place).
It could also be from the tappet plate edge, which rides in a track on both mechbox halves, not slipping into place.
You just end up getting a knack for doing it after a while...it's something I find very hard to describe in words...but easy to demonstrate in person.
That's a version 3 right? I've sometimes found that the switch assembly "housing" gets out of place. It's kind of loose/flimsy..but stays in place when the mechbox is closed. See how the wires are under the mechbox...as you're pushing down, the wiring is pushing the switch assembly up. Might not be the cause...but it ain't helping.
Best of luck...when you hit max frustration, take a break (release spring tension!) and come back to it later...
Tys
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