3-4 sticks/pins sticking out fitting in the holes on the other segment

somehow click-in

possible to "unclick" them with button

winding on one side

hollow screw on the other (universal Hohlschraube)

N holes

to be filled with N magnets

glue before putting in the magnet

The same as "pure magnet" solution but with a steel/iron "hat" atop the magnets which are screwed in the bamboo.

Problem: bamboo not completely circular

Tubes or different materials

3d printed ?

cauchouc