A little bit of super glue should do the trick, just like it does for Wally's GFA Hopper (similar style, could probably be used for October Caddis, too):
http://www.youtube.com/watch?v=juofPgOpic4
Very interesting to see how John's flies have evolved over the past few years. Simple flies that catch fish; can't ask for anything more than that.
Regards,
Scott