The Office supplies trebuchet

Step 3 Now shape them

At the very end of four of the paperclips, make an eyelet big enough to insert an ex paperclip through (but not much bigger).

At the other end, make a dog leg. Try to make it on the same plane/axis as the eyelet.

EDIT: Ignore the dogleg. Instead bend approximately 1/2" of the non-eyeleted end at right angles (90 degrees) to the eyelet. All will become clear very soon.