What's This For???

[Tim k]

Fish hook holder?
How many guesses do we get?

[tgtaylor]

This aint no joke Tim. I recently purchased this, which came without instructions, and this morning I figured out how to attach it to the cameras but I am at a loss for what the chain and hook are for. The chain is attached to a thin rod extending vertically and at the bottom the rod is bent horizontally across the body. I can't figure out its purpose.

Thomas