Pentagonal Hook Piece

This piece is designed to accept a chain or rope so that the polyhedra ( http://www.thingiverse.com/thing:5961, http://www.thingiverse.com/thing:6178 ) can be hung from the ceiling.

Specifically, I'm working on a soccer-ball shaped ( truncated icosahedral ) lamp using http://www.thingiverse.com/thing:6055 as well as the pentagon from http://www.thingiverse.com/thing:5961. I need some way to hang the lamp.

I believe p_hook_3 is the strongest design and least likely to fail by delamination.