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My friend made stainless steel screws for the CK FunBolts axle. The washers are also stainless steel (DIN 433).
And some other parts for the puzzle.
Garbaruk 11sp 10-46t
Garbaruk 28t Boost
Schwalbe Magic Mary Super Ground Adix Soft 27.5x2.4
Schwalbe Wicked Will Super Trail Adix Speedgrip 27.5x2.4