T.D.W. What is your current experience level with trapping and or fur handling? Are you looking to get into it?
I told you this stuff gets deep! You need different stretchers for different pelts some have to be turned inside out some skin side in, if you are serious you don't even want to use wire stretchers use wooden stretchers. I would suggest a video called Fur Handling 2000 by Hal Sullivan.
http://www.sullivansline.com/