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screw cut your thread to the nearest pitch nearest the correct pitch to a depth of 1 mm, this will allow the tap to bite. cut as much as you can in the lathe, this will keep it square, but i suspect you will have to finish it on the bench. use parrafin as a lubricant, white spirits works, cold...

Sorry if this is too late a reply. My dad thinks its a blacksmiths 'punch' used for putting holes in hot metal. There could be another part to this tool , spring tongs for the apprentice to hold the punch in place.

Hi everyone, my Dad and I have made a short series of videos showing how he made a larger than life model of a jungle spider, for our garden. Hope some of you like what we've done so far. The final part 4, will be published before christmas. So here are the first 3 parts, much appreciate it...