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Explanation: I believe the (pair of) tongs do not move (push or similar) it's the jaws of these pressure tongs that move to create the braking or positioning/locking pressure for the axle on which the turbine is mounted.
The word 'shub' is therefore related to the mechanism creating the pressure of the jaws.
Duden-Oxford+Norsteds+professional experience with such brakes
Mats Wiman Sweden Local time: 22:22 Works in field Native speaker of: Swedish PRO pts in category: 4