So I've been playing the violin for sometime, and I can play pretty well. But when I try vibrato, I simply cannot get it. I've been trying for ages now, and I've noticed that when violinists use vibrato, they move so that the finger tip slightly bends back and forth so that the final digit oscillates between an obtuse angle and an acute angle.
However, my fingers look like this:
So I can't move my finger in that motion, because my fingernails get in the way. Is there any other way to use vibrato that doesn't ultimately involve moving the fingernail in this particular motion?