Yeah David, it's a two pronged needle that does that. Looks like a little tiny bicycle front forks! I don't know if the sewing machine HAS to be a special type to use them though. I would have liked to been able to do that for my canvas, in some areas such as joining pieces across rear canopy. I can make two passes for that effect, but I have no expectation they will be parallel.
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Ford CMP, 115" WB,1942 (Under Restoration...still)
Medium sized, half fake, artillery piece project. (The 1/4 Pounder)
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