https://www.instructables.com/Dead-drop-spike-v1/
Dead Drop Spike V.1 : 5 Steps (with Pictures) - Instructables
Dead Drop Spike V.1: This is a project I made a little while ago as a birthday present for my friend Daniela who introduced me to geocaching. It is based on...
dead drop spikev 15 stepspicturesinstructables
https://www.instructables.com/Dead-drop-spike-v2/
Dead Drop Spike V.2 : 7 Steps (with Pictures) - Instructables
Dead Drop Spike V.2: This is my second version of a dead drop spike. It is based off of several designs I saw in a book on spy gadgets. They would have been...
dead drop spikev 27 stepspicturesinstructables
https://makezine.com/article/craft/deluxe-dead-drop-spike-in-solid-sta/
Deluxe dead-drop spike in solid stainless steel - Make:
May 18, 2010 - For those who aren't up on their tradecraft, a "dead drop" is a place where spies or other clandestine-y folks drop off items for later retrieval by other...
dead drop spikesolid stainless steeldeluxemake