I have uploaded a video to YouTube of a left hand technique I invented to improve fluency and intonation when playing the double bass.
It includes some pages of music which come and go quite quickly, so I’ve put them here in case anybody wants to study them a bit closer.
Firstly, here’s a few examples of how you have a choice of four springback fingerings for any three notes on the double bass.
Secondly, here is a way of fingering the end of the Otello solo using seven springbacks.