DISRAELI DOCUMENTS
This is a pretty informative short video. Amongst other things, it expalins the Hall lock on the TRP DH7 derailleur.
It's a pity about the opening titles. What exactly is the function of the dash in 'John's - Tech Talk'? And did nobody check the spelling of 'Deraillure'. Moofe fvasT adn bRakke tHigns.