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semble sunglasses.
Even if the parts purchased by B&L Ireland and by B&L Hong
Kong had passed the incoming inspections conducted by each of
those companies, an operator still could have experienced some
difficulty in assembling those parts due to a problem known as
tolerance stacking. Because the incoming inspections at both B&L
Ireland and B&L Hong Kong tested to established tolerances,
purchased parts were permitted to deviate from the nominal
specification (viz., the ideal size) for those parts within a
certain range and nonetheless pass inspection. For example, if
an operator had attempted to insert a lens that was larger than
the nominal specification into a frame that was smaller than the
nominal specification, the operator may not have been able to
assemble those parts correctly.
Metals
At both B&L Ireland and B&L Hong Kong, the operator received
the parts to be assembled along with a manufacturing order
detailing the SKU to be assembled. The operator began assembling
the metals by picking up a front and using a screwdriver to open
the left and right lens screws in the endpieces on the fronts by
turning them three revolutions to permit the operator to attempt
to insert the lenses properly without damaging the lenses or the
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