placing against said one surface of said base a first molding block having a plane surface and at least one first recess formed in said plane surface, said first recess having a configuration for molding said projection and having an aperture opening out of said first recess through said plane surface which has {HEAD ~ a cross sectional area} larger than that of said first opening in said base plate, said first molding block being placed at a position to cover said first opening with {TAIL ~ said aperture} of said first recess 
placing against said one surface of said base a first molding block having a plane surface and at least one first recess formed in said plane surface , said first recess having a configuration for molding said projection and having an aperture opening out of said first recess through said plane surface which has { HEAD ~ a cross sectional area } larger than that of said first opening in said base plate , said first molding block being placed at a position to cover said first opening with { TAIL ~ said aperture } of said first recess
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