Hi Wrist vs. Low Wrist & A Stiff Left Thumb

I finally actually really understand what Mr. O was saying with the High Wrist vs. Low Wrist ... I finally get it ... the breakthrough came from a combination of watching a Tortellier masterclass where he says you have to have the same power of attack at the tip as the frog & from working on Dotzauer Etude #4 and struggling to add the bounce in ... which led to me thinking about how I used to get it, and how I used to get the bounce in the bourees from Bach Suite 3 ... then I though about initiating the stroke with the middle two fingers, then I started doing double stop open string exercises, and took the music away, and it all clicked ... I finally completely get it...

So Low Wrist is when (at the tip) the wrist is lower than elbow level ... high wrist is when it's higher than elbow level ... apparently some people like the high wrist approach ... I think it's been the most debilitating aspect of my bow technique, and I'm so glad I've finally consciously identified it, so that I can go back to the way I used to bow (in that regard) and go forward to developing good bow technique.

General principles for bowing:
-Elbow is like a door hinge
-Motion of the bow arm is like snake

These were like 2 of the very first things anybody ever told me about bowing ...

Also, I figured out why I've suddenly developed a tea-cup pinky in my left hand technique (this was confusing the crap since the beginning of this week) ... the answer: not bending my thumb...

So there we go ... 2 major problems solved ... This has been such an amazing day of practice ... can't wait for tomorrow ...