If you’re tying big bugs like the Zoo Cougar or the Countermeasure — any larger pattern with a deer hair fan collar or spun head — the Renzetti R-Evolution Magnum Hair Stacker is a godsend. It’s got an extra wide mouth for those pencil-plus sized clumps; no more struggling to get the hair into the opening. And with four flat-side grips, the base is easy to handle. This is one of those tools that makes you wonder how ever managed without it. While you’re at it, check out this great primer from Kelly Galloup on spinning and setting deer hair.

The Renzetti R-Evolution Magnum Hair Stacker. Support your local fly shop by buying one there.