Here are a staking machine and its mechanism. Hardened leather after drying is sandwiched between vibrating stakes to soften the fibers of the leather.Boarding by hand or machine is another method to soften leather. Besides softening, it develops grain patterns — willow grain, box grain, and pebbled grain. Box grain is considered as one of the origin of box calf.Here are other explanations of its origin from Handmade Shoes for Men.These are current definitions.
4/12/14 at 6:22am