For me, spring and ball is some kind of check valve, but nothing like that on any 2t.
Encircled part will check the cutout, but it is most probably made for the gear.
You're right on the bottom end side play, but this is gearbox secondary shaft area. Will go through some old pics to check for polish being factory or "aftermarket"
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EC 300 2008
EC 300 2018 GP
tenere 700
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