#21 Watt Bolt NW39

Holy Trinty CE Primary School invented this mechanism.

Oksa’s design is based around a giant door.  Oksa’s also shown a zipwire with a stick that flies down towards the keys. However, we have other designs with things sliding along wires, but no other giant doors, so we decided to focus on that. We’re also grateful to Oksa that this was quite easy to implement: we bought a large door, mounted it in a simple frame and added a string. Perfect!