Agroshield
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The trick is getting the holes for pins and holes in the die lined up perfectly.
One way to do this is to make the two pieces as a matched set. Join the two pieces of blank material together and mark their orientation. Make each of the six or eight holes in both pieces at the same time.
If your facilities do not permit interchangeable manufacture, you can always make two items fit in one and only one way. That's how Joe Whitworth started out - a bolt and nut made in factory A would always fit together, tighten up and perform splendidly. It was just that you could never screw bolt A onto a nut made in factory B.