I spotted this Park Tool video earlier today. The main man Calvin is always worth a look, but this is particularly interesting - to me anyway - for at least two reasons:
1) the funky device for showing how friction lever bikes work. I've never seen that before!
2) the comments about JIS screwdrivers...
Five minutes: https://www.youtube.com/watch?v=DOVH6ph10vs
A Brief History of Derailleur Adjustment - Tech Tuesday #88
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