Would you have a problem with this? in General geocaching topics Posted May 22, 2003 Just make sure that there's no chance of some unlucky logger or mill worker getting hurt by a nail breaking a chain or blade. Use very light nails or ones made of a softer material. ie. copper, aluminum, brass. Putting spikes in tree's is a major no no and is an act of eco-terrorism. Get caught doing that by a forestry worker and you'd be lucky to get out of the woods to face the authorities.