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Lock and Load!

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After the type has been set, the next step is to lock it in the chase, an open rectangle of steel. You lock it in by strategically surrounding it with furniture (the larger pieces of wood), reglets (the skinnier pieces of wood), and then tightening it up with the quoins. The quoins are those metal pieces above with the hole in the middle.  With a key you insert in the hole, you can expand the quoin to apply the pressure that locks everything in place.