The Ton Kooiman Prima Thumb Rest is definitely an excellent solution for training students to play with the right thumb in the correct position on the flute. I think it is the best on the market for dealing with this issue, mainly because the semi-permanent position of the mounting plate ensures that students always practise at home with the thumb in the correct position. Since the Prima also adds stability it also reduces tension, either in the right hand or against the chin or even in the left hand.

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