Rx: Executing short distance shifts through finger replacement
Don’t worry, you’ll keep all the fingers you started with. But you’ll learn to replace them on a single note. You can achieve a major third in this way.
From Michael Klinghoffer’s How to Drive a Double Bass series.
Includes an exercise for using different fingers on the same note, for finger replacement.
Also a very fun demonstration using finger replacement plus a short shift down and a short shift up to play everything between the open A string and the F# up the G string.