Clamp the scraper as close to the scraping edge as possible in a jeweler's vise or similar hand-held tool.
That seems to be a nice tool indeed @Bob Cleek . I found it's specifications online. The depth of the claws is only 15 mm (0.6"), while the shaper measures 35mm x 50mm (1,4" x 2"). Especially when using a slot on the short end of the shaper this makes it impossible to clamp it close to the scraping edge. Should I assume this is not a problem?
