Vibrato advice from Gary Karr

[james zauner]

I was taught that when doing a huge shift, try to almost always shift to 2nd finger. it is easiest to vibrato, it is the longest finger, the middle of the hand, so it is more balanced. It is stronger than third or fourth, obviously. Try doing it. Vibrato almost happens naturally when making a shift to 2nd finger. But as far as practicing vibrato, I haven't found anything that works too well with that. The hardest part is at the 'break'. Any tricks anyone has found to vibrato like the F natural on the G string with 3rd or 4th finger? I have started using 3rd finger on F and E, and it makes it a lot easier for me actually