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The scroll of my violin shakes slightly when I vibrate, and this is especially annoying on an up bow when I reach the frog. At the frog I can't consistently keep contact between my bow and the strings.
Something interesting I noticed is that this happens when I do the vibrato movement really slowly. With further insight it seems that the shoulder rest is in contact with the shoulder joint slightly. When I vibrate my left shoulder moves slightly and this causes the contact point between my shoulder and neck to wobble. But I have no idea as to how to fix this. Any help will be greatly appreciated.