I recently noticed that when shifting up to 3rd position, I bump the body of the violin with the heel of my left hand. I think this gives me a good reference point so I can consistantly get to the same spot. In that respect, it seems like a good idea for achieving good intonation.
But I've also been working on improving my vibrato, in particular, maintaining a steady vibrato when shifting. I set the metronome to 95 mm and vibrate twice per beat (16th notes) while playing scales. When vibrating, it is difficult to get a free motion when the heel of the left hand touches (e.g., bumps) the instrument.
So, to bump or not to bump, that is the question.
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