The use of the Etude invites you into a new way of carrying your instrument!
The thumb is held higher and is either straight or slightly bent. The result is a "natural and individual" posture.
The place of the mounting slide must allow the Etude to be fitted on the instrument at that height, that when you are playing the instrument, the thumb will be opposite the index finger.
You can use the holes from the "old" thumb rest, but in certain occassions it might be that you will have to use new holes, please do not try to do this yourself, it can be fitted by the Howarth Technicians in London!