Standard single edge razor blade clamped on arm. Adjustable dowels, clamped, with one 3/4" dowel. One dowel is turned to 10ga, on one end, 12ga. on the other. Second dowel is turned for 16ga. on one end, 20ga. on the other end. third, single ended dowel for 28ga. Closing the handle cuts into the hull, and a single twist of the hull cuts is cleanly.
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