when working with this type of clamps

The working position is below the pivot

U-fork pivot unit with the 170° rotation

Straight Side Clamps for Hapstone R2 and Hapstone Rotating Module utilizes flexible flat spring and spacer screw to secure knives of any shape including a full flat grind

jasper stone edge pro when working with this typeJasper sharpening stones are used for finish sharpening and honing knives on Hapstone and Edge Pro sharpeners. Jasper is a naturally abrasive material of high density. Jasper stones are mounted on high quality aluminum blanks. Jasper is mined in the Ural mountains in Russia. Jasper is a dense, opaque variery of cryptocrystalline chalcedony, contains significant proportion of Fe oxides and hydroxides. Jasper does not consist of individual abrasive