The marlin spike is a useful tool for the sailor. It helps separate knots, splice and braid lines aboard a boat. Rigging can be done on land too.
Marlinespike is a bit of an archaic word going back centuries. Basically a line spike, one of two tools a sailor carries. The other being a rigging knife.
I made these out of tool steel, rod O-1. I hammered out a 2 inch piece to 6 inches with the help of a forge. I drilled a hole and hardened the steel in oil. Then I then tempered it in an oven for 2 hours at 420 degrees to make it flexible and not brittle.
With a closer view of the forged marlin spike