Longtime,

shredding isn't good. I once decided to avoid the high cost of feather cutters/burners by making a router jig to hold the feather again a bearing bit, and thereby profile it. Funny thing the feather was imune to the cutters rotating at 20000 RPM with enough force to take off your arm, and sharp too. The feathers just bent ou of the the router's way. I couldn't believe it, feathers are some amazing stuff.