Been planning on making myself a threading jig going on 2 years and finally got around to it this past week. The jig is similar to commercially available units that push $300. I have about $122 invested in this one.

These are some of the components that went into making the jig.
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Mounted it looks very similar to factory units.
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The cutter is identical to those use with factory jigs
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This is a close-up of the threads cut into a quickly turned plum box.
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It wasn't an exact fit on first pass but taking an extra slightly deeper pass on the lid made for a great fit. The threads on the lid did not get close enough to the lid flange but a parting tool cut next to the flange solved that problem.
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"Continued in the next post"