What's keeping that pump on there? Is there a peg of some sort or is it just squeezed in and the strap stops it popping off?
Magnets.
Actually the pump is sprung so it grips onto the seat post clamp and headset up, there is also a small Velcro strap which is for added safety
@spotter started
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What's keeping that pump on there? Is there a peg of some sort or is it just squeezed in and the strap stops it popping off?