TinnerFlow™1st YearHand Tools, Fasteners & HardwareField Reference
Closing aviation snips completely forces the bypass tips to pinch and tear the sheet rather than shearing it cleanly. Use short, rhythmic 3/4-strokes. Re-open the jaws right before the blades hit their absolute crossing apex. This keeps the tool centered.
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You are notched-cutting a starting hole for a rectangular tap collar. You pull the handles of your snips completely closed on every single stroke to speed up the cut. The tip of the blades leaves a ragged, tiny horizontal tear at the end of every cut, ruining the airtight profile.
Closing aviation snips completely forces the bypass tips to pinch and tear the sheet rather than shearing it cleanly. Use short, rhythmic 3/4-strokes. Re-open the jaws right before the blades hit their absolute crossing apex. This keeps the tool centered. The likely recovery is to check the tool setup, correct the prep or technique if it is within your assignment, and bring the journeyman or foreman clean information before the work creates rework overhead.
Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.