Summary

This object is used in a geocache to provide a lock to a door which can be unlocked using magnets placed on the magnetsign on top of the lock.

Instructions

Designed with TinkerCad to be printed with a 3d printer.

To complete this thing, you need:

1x magnet 12mm outer diameter and 6mm inner diameter
1x bolt M6x25mm.

Construction:

Put the magnet around the bolt
Put the bolt (head up) in the cylinder
Put the closing cap at the bottom
Screw the combination to some wood where a hole is drilled to fit in the cylinder.

How it works:
When one hold another magnet on the magnet sign, it will attract the bolt with the magnet arround is and thus lifting it which unlocks the door.

BoltMagnet doorlock