Hi. I'm new to the double bass forum. I need some help because I have some major technical problems in my playing that are hindering my ability to progress. They are the following: 1. Bow technique- I play French bow. I have a tendency to spread my fingers out very wide across the stick making a death grip on it and locking my thumb. Consequently, the joints in my arms become stiff and i use the motion of my shoulder. Recently my shoulder has begun hurting while I'm practicing, and it is also very difficult for me to do quick notes and string crossings while the joints in my arm are locked. This locked position also makes me lose my musicality in fast passages because I am struggling so much with my bow arm. I have been told to play more on the side of the thumb and play like my arm is just swinging from my side and take that relaxed position and just place it on the bow. I have also done an exercise where you completely take the thumb off and support the bow with the pinky finger to try to get the feeling of a loose grip on the bow. 2. I have a problem of lifting my fingers too high off the fingerboard. My bass used to have strings that were so high off of the fingerboard that I could slide my entire hand between the strings and the fingerboard. This is now fixed, but I still find my fingers lifting up the same distance they used to be required to. 3. In thumb position, the joint in my finger collapses (also from the old setup). I've started to get better about this, but if I have to stretch for a note the rest of my fingers collapse or if I'm doing fast passages. My fingers then get locked in this new position. 4.Vibrato-My vibrato is way too fast and tight (also from the old setup). I have subdivided the oscillations of the hand with the metronome at 60 making each oscillation a quarter note, then eighths, then triplets, etc. I find that I can do this exercise but when I actually try to vibrate it's still way too fast. Also, I can't hardly vibrate in thumb at all because of the above problem of fingers collapsing. Do you guys have any technical exercises that could help me with these problems? I really want to get better because I love the bass. Thanks!