Tennyson,
        I'd say that the apertures on the stencil would act as Venturi meters. Thus
the smaller the apertures, the greater the flow rate of paste through them.
(Discharge coefficients would be determined for each aperture size and used
with the Bernoulli equation for the correct flow rate).

Martin Farrell (Chemist)
GEC - Marconi Avionics,
Edinburgh.

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