My theory is that if you remove one data source (vision), which may not be necessary for the task in hand, then that is less data for the brain to process, so that it can concentrate on just two data sources, hearing and what the muscles are doing (in the shaking bow case). I use this "eyes shut" technique when working on other aspects of violin playing, such as intonation, shifting, optimum sounding spot on the string, fingering.
UGU, available from Amazon is really great for fastening the thumb leather.
I know there are people who like rubber tubing but it does not give me enough feel of the stick - too squishy!
I use these three visual references or keys:
Triangle: Heel/frog of the bow
Square shape: middle of the bow
Triangle: Tip of the bow
I would just work with whole bows on open strings, and try and watch when I have a shake, and try and pay attention to where in the entirety of my arm do I have some tension, which could well be in the shoulder. I might then watch to see if my thumb is indeed providing too much upward pressure, which probably means that my hand is not providing its natural weight, and just work with the overall sensations.
That sort of presupposes that I can have that level of awareness, and that is likely where Alexander Technique has been helpful for me. If I start thinking too anatomically, it takes me out of my awareness when practicing - A little paralysis by analysis in my case. The sound can also be a guide, in terms of trying to really point the ear to the most minute deviations from total smoothness, which can then be fine-tuned in a very individual, feeling-lead way.
I know the French call it push and pull, but I like to think of a dragging relationship between the bow and elbow, like oxen dragging a plow, with the oxen representing the hand/bow on the upbow and the elbow on the downbow. How dead of a weight can I really make that elbow?
Of course, it's all just imagery and metaphor, and we don't need to go back to the good old book-under-the-arm days.
The two standard bows are susceptible to shaking under some circumstances, but I control it. On the other hand my baroque bows do not shake. Why should this be? Is it an indication that there is an inherent shakiness in modern bows, but not in the baroque design?
While bow shaking can be due to an essential tremor or something of the like, it is more often a symptom of a tense upper arm/shoulder or a misuse of the middle/ring fingers on the bow to "force" the bow into the string. What both of these things have in common is that they result in the player failing to truly balance the bow, meaning that the point of application of the bow's weight is in several places rather than directly under the index finger. This gives a less focused and coarser sound, and the shaking is due to the bow not being balanced. I'd advise a focus on the third and fourth fingers, ensuring that they loosely adhere to the bow rather than gripping it. This would prohibit you from using upper arm/shoulder tension to play into the string and give a purer sound.
The psychological component at play here (no pun intended) is that a continual use of tension to play very loudly and very softly (both of which will result in bow shaking) becomes a self-fulfilling cycle. When you come to associate loud playing with lots of physical force and soft playing with lots of physical restraint, it becomes very difficult to simply relax for all of it and let the small muscle of the hand/fingers take care of it. It takes of lot of time and patience to re-train your arm and muscles to not react to dynamics in such a visceral way, but doing so really frees up your playing to be so much more musical and creative. My advice on this: record yourself and listen to your sound. You'll be surprised by just how much sound/volume you're actually producing, even if your brain is telling you "I'm not trying hard, so it must not be that loud". The turning point for me and my playing was learning to listen rather than focusing so much on the kinesthetics of playing.
Best of luck to you! If I could do it, you certainly can :)
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I have found three ways to alleviate this problem:
1. tiny dose of Inderal (or other beta blocker)
2. thicken the thumb leather of my bows - this works sometimes
3. hold the bow with fingers on top of stick and thumb below the frog, keeping my fingers and thumb well separated.
But I will try what you suggest.
Thanks for posting it.