When servicing the trans on the bike the Inside parts do hang down a bit
I just move the rear wheel if cover hung up on that main gear bearing and or turn flywheel if hung on the clutch bell bearing but for me most times it’s main gear hanging down a mm.
Just like two weeks ago when I took apart the transmission on my gila magnum because I felt excess vibration.
My my two speed driving plate the gear came loose
and also damaged the thrust washer,
I glued the gear back on the drive plate and put a new thrust washer in. When putting on the sidecover on it hung up a little bit so I had to move the rear wheel and then it popped all the way in,