Marc Petitjean tying a CDC Spider 

north country spiders are very slimly dressed and not over hackled as in your demonstration less is best in this case

very beautiful fly, but I would not call it a spider. The North Country Spiders I have learned from Mike Connor and the literature on the matter show flies much less dressed than this CDC fly. Nice, but missing the point of a spider really. I made the same mistake many times and overdressed spiders, until I really tried the more original recipes. I was rewarded with a huge grayling when nothing else worked.