Simple clothes peg to fix clothes to a rail guard on a sailing vessel against sliding.
It needs the spring of a real clothes peg that seem to be pretty standard at least for this type of pegs.
I uploaded to versions, one with a nose against shearing the parts and one without. The nosy version is better but needs support, the other does not.
I refrained from making a plastic spring of any kind because those tend to be a bit on the lazy side. Which is bad with heavier winds.

Note:
The picture shows a version with text (SPIFF, http://www.thingiverse.com/thing:106256) added.
I removed this for simplicity or usage.

See http://www.thingiverse.com/thing:229084 for instructions how to easily assemble the spring.