How do I avoid the short-stroke snap-lock button punch miss?

Button-punch locking tools require a full mechanical stroke to form an irreversible, structural interlocking button lip through both plies of sheet metal. Open the long handles completely wide, seat the jaw indentation dies flush over the exact center line.

['You use a manual hand button-punch pocket locker tool to secure a slide-fitting joint on a section of rectangular ductwork. You squeeze the long handles halfway shut, making a shallow, flat indentation. When the main fan unit pressurizes the trunk line, the mechanical lock pops open and drops the branch line loose.', 'Button-punch locking tools require a full mechanical stroke to form an irreversible, structural interlocking button lip through both plies of sheet metal. Open the long handles completely wide, seat the jaw indentation dies flush over the exact center line. 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.']

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