Hi again, Shiroi98, my friend! What a very good improvement in this second video! Please focus on 2nd, and 3rd finger only, at first. You have the exact right motion, but 1st finger is a tight, close finger to wiggle. And 4th finger is… just… hard. LOL! OK so now that your index finger base is not stuck, we can focus on the vibrato action. First, you understand, the vibrato ‘wave’ goes away from your nose, and toward your nose. Also, we should keep in mind, the motion goes under the pitch and TO the pitch, never above. You’re doing this. I just want your brain to think on these things. Also remember, you may touch the violin neck at the base of your finger, but don’t allow yourself to ‘stick’ there.
The vibrato motion itself right now is uneven and narrow. So to fix unevenness, practice in a rhythmic fashion. On A3, play the vibrato in 8th note pulses about 120 bpm, 4 pulses per bow, DOWN and UP, several times. Very slow, wide and measured! The knuckle closest to the fingertip should be very loose as the finger rolls back and forth.
Naturally, the hands want to do the same thing. It’s a big challenge in playing violin! So while you are wiggling the left hand, the bow is stuttering, wanting to make a similar motion. It is important to steady the bow, using full, relaxed bows. Press your scroll against a wall to keep the violin from moving. Now move the bow a few strokes to set up a tonal base ‘feeling’ before you add the difficult left hand motion.
Once you have a steady, wide, 8th note vibrato on 2nd and 3rd finger, try it on 1st and 4th, knowing those fingers have built in weaknesses and limits. But you will overcome them!
Next, double the speed of the pulses, but maintain the wideness of the motion. So now, at 120 bpm you will get a full roll back and return, 4 of this motion per bow. Once that is easy, double it again. By now, you have a workable vibrato, and you don’t even have to count rolls. Just keep it wide open and steady while the bow is full and heavy.
Here is a great vibrato tutorial that shows the vibrato motion in slow motion and up close!