Lane, If you allow the deer hair to be uniformly spun around the shank of the hook as you flare it (tightening the thread wraps), that's spinning.
If you do not allow the hair to spin around the shank as you tighten and flare, that's stacking. Over-and-under stacking is tying two stacks opposite each other, normally of different colors, to get a top-side color and a belly color. Packing is crushing the deer-hair stacks or spins to the rear of the hook to create density or designs, then re-tying in front or that packed section, normally with more deerhair to continue the design forward to the eye. Spin/pack/trim multiples for bass-bug heads. Stack/pack/trim for sculpin heads and such. DonO
