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Almost Unbreakable

Due to the Corona problem, I can't get any thin-walled aluminum tube at the moment. Therefore, I have pimped my old and very much used PVC resonance tubes with a new type of flap.

The new flaps are printed from flexible plastic with a hole "too small" by about 0.1 to 0.2 mm. Therefore, they adhere very well to the shaft after sliding on, but can be aligned and positioned as desired.
I also managed to make this solution foldable. Due to the magnetic coupling, the shafts reconnect by themselves after splitting.