Usually, the blades are so narrow that clamping them in the vise and being able to get at the edge without hitting the corners of the vise is the main problem. A Low Angle Adapter will usually work. I clamp the tip as close to the vise as possible and hold the handle either with my off hand or with the RAM mounted clamp, sort of like this:
I saw an interview with the owner of Martinii knife company, and during a plant tour, he stated that they sharpen their filet knives to 22 dps.
Like any other knife, you choose the grit according to the degree of damage needing to be repaired. A simple touch-up could require only 800 or 1000 grit to start with.
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