[This is post #13 in a mini-blog-post series for NaBloPoMo 2015. Jump to the first, previous, or next post.]

Keep yesterday’s stacks stacked, because we’re starting today by punching out the oval holes. (This goes much faster 5 layers at a time!) Two punches per oval, one at each end, works very well:

Repeat on all the ovals.

Next, fold the stacks on the creases as shown: down (mountain fold) in the middle, and up (valley fold) for the four tabs.

We can finally undo the stacks with a staple remover (or simply by undoing the binder clips), and our units are complete!

Tomorrow we get to assemble them!