perching
The process in the manufacture of some leathers
wherein the skin is clamped in a wooden frame (the
"perch") and flexed by a scraping action on the
flesh side with a moon knife (or arm perch).
Perching is done on very soft, delicate skins, as
well as on some furred or wooled skins.
Essentially, it is a variation of STAKING . (306 )