ATTENTION, there are 2 variants to determine which variant you have

Simply unscrew the other axle piece that is still there and inspect it.

ATTENTION, there are 2 variants to determine which variant you have simply unscrew the other axle piece

that is still there and checkt it.

Axle end piece for Eckla axles with pressed M6 thread insert into the axle.

Axle end piece for Eckla axles with pressed-in M6 threaded insert in the axle.

or

Axle end piece for Eckla 20mm axles without a pressed thread insert in the axle.

Axle end piece for Eckla 20mm axles without pressed-in thread insert in the axle.