Testing material: 16mm plywood with 1.5mm hard leather
Date: 2013-03-01
Testing equipment: HIGHTEX 204-370 (CowBoy #7204) extra heavy duty flat bed triple transportation lockstitch sewing machine with large barrel shuttle hook (refer to www.cowboysew.com/product2.htm)
Needle: Schmetz 794 (7X3) Needle - size 250/27
Additional device: Ball type speed reducer to increase the punching power
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