Natrix-- The Waddington shank I understand, but I'm unclear on the spinner shaft... I'm guessing that it has a loop on one end that slides onto the shank. Then on the hook end there is another loop that clips open and closed, right? You slide the tail hook on that and wrap chenille over the clip. Is that correct?
How long a spinner shaft do you use?
That Waddington Bunny Leech you tie definitely looks like a shock and awe fly-- I'm going to have to get busy tying for a trip I'm making to Alaska this summer...