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Mike - are the flats on your hex dies, presumably meant to be turned with a spanner, concentric enough about the central thread to line up axially on the workpiece to be threaded? Also, the non adjustability of the die nuts seems a bit of a difficulty as compared with the circular split dies. Dave
These Die Nuts are usually used for repairing damaged threads, and usually get run onto the thread with a Crescent wrench, or what ever is to hand.Ian S C