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They are forming taps, as you say, for soft materials.Years ago we used them at work, often on sheet ally or occasionally copper.Hole punched by a sort of centre punch, then one of those sent through.Always seemed a bit crude to me but it did the job.Dave
What an elegant looking engine! I really like the color.The colour is ' Old tin off the shelf green' It does not have a label so i don't know the exact shade !!! also the computer decides the shade in the final analysis !!! thanks for the comments end not long now to completion.........