5Crank Shaft - Can you dig it?
Time to crank up the difficulty a little :P. For this piece you'll need an unused strand of plastic cut into three pieces (two larger pieces of the same length, and one very short piece that fits in the middle).
Doodle each longer strand piece into place, resting it in the middle hole of the paddle-shaped pieces you've made on the stencil. Make sure both paddles and both longer strands are aligned.
The smaller strand segment will connect both paddles together in a similar fashion - be sure to thread it through one end of each of the two remaining stencil shapes. Afterwards these should freely swing around, just like hands on a clock.