https://www.youtube.com/watch?v=J8tQh8clAKE
Jesus, that's almost as bad as that seat-stay mounted, chain-driven coffee grinder
That really needs some kind of air chamber that you charge with the pump then let out with the lever to control the pressure.
@Nef started
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https://www.youtube.com/watch?v=J8tQh8clAKE