Hi bldegle2 just reading this.
I understand your analogy, but most bike enthusiast do not
have this tool otherwise would do this first chance.
BUT, shifting up and down is perfect. no indexing needed.
I suffered yet another fall today. 3rd time in 2 weeks I think I need to bite
the bullet and get another rear derailleur to hopefully resolve this once and
for all! It's getting past annoying. thx
Ultegra R8000 (one with issue) 12-34T cassette 50/34T crankset
Shimano 105 (comparison) 12-32T cassette 50/34T crankset