Double Threaded Bolt Geocache

thingiverse

This geocache is a double threaded bolt with accompanying clockwise and anti-clockwise nuts. There is a slot to allow a 13.8mm 'slim' bison tube to be placed inside. The _NoSlot model doesn't have a slot but has a cavity with an internal diameter on 20.4mm. A slot can be added using software such as Tinkercad to suit a particular container. It is best to make the slot diameter as small as possible (still allowing clearance for container) as the larger the slot, the more likely the nuts are going to bind. If a slot larger than 15mm is required (allowing for clearance) increase the scale the bolt and nuts up before creating the slot. This will reduce the ratio of missing thread to bolt size and reduce the risk of binding.