If you own a higher-end bike with a Shimano drivetrain, then chances are it's got a "secret" storage compartment: the hollow space in the axle, that connects the Shimano Hollowtech cranks.

We focused on what I thought was the easiest first. A wrong-sized nut had been tightened snug onto the front axle of his spare bike. Looked like a simple fix. Boy, was I wrong. No ratchet or ...