✕DO NOT FORCE THE FIT
- The tuck. The knife trims the margin; a blunt stair tool buries it. Spine-tucking slices edges short.
- Face-cutting loop pile at volume. A guided loop pile cutter's job — not in this store; the back-cut above is the knife answer.
- Cutting over surfaces that must survive.
- Over installed pad, finished stairs, or hardwood that stays, an open point can reach what's underneath; the captured-throat hook blades (42200 in a utility host, utility line; 67090, industrial line) exist for that case — and in the open field or a mid-goods start, the hook is helpless and this open blade is the only tool.
- Complements, not rivals.