$1.67 has a point. If feathers are older and "well cured", they are a pain to strip. They will tear out and short-strip enough to make the most seasoned stripper wanna go home. I use steam on mine. Just like steaming fletching on an arrow shaft to renew it. Just slowly run that feather thru the stream of steam from a teakettle on the stove and VOILA!
Hot, steamy stripping!