many diffrent pens make good tension wrenches/picks
http://www.qarnnsratings.cwc.net/Pens.gif
the one on the bottom I happen to own, take off the clip and some filing makes good pick or wrench. but that pen is hard to find. get those felt-tip onse that are generally grey and have a cap. take the clip off of that, and when you do the end has a nice end for a tension wrench. Just the other day I looked at a pair of headphones i got off an airplane flight and noticed the wiring that keeps them on your head, that is very thin and also greatly strong. Right now im using cloth hangers but they are not very strong, they were only thing I could find. Also you can just get some street cleaner bristles I hear those are the best. Also iv heard of hacksaw blades and metal-rake ends. and a tip, never use a paperclip, you have many choices and all are better then a paper clip.
hope that answeres your question!