Patent ID: 6893213

Claim:
An apparatus, comprising: a two-housing assembly including a first housing ( 11 ) having a plurality of first spaced apart non-threaded openings, and including a second housing ( 12 ) having a plurality of second spaced apart threaded openings registerable with the plurality of first spaced apart non-threaded openings; and means for holding the first housing ( 11 ) and the second housing ( 12 ) in a desired spaced-apart relation including a plurality of adjustment screws ( 21 ) each having a shoulder portion ( 21 a ) and each passing through one of the plurality of first spaced-apart openings and threadably passing into one of the second spaced apart threaded openings in the second housing so as to have the shoulder portion ( 21 a ) disposed between the first housing ( 11 ) and the second housing ( 12 ) and so preventing movement of the first housing ( 11 ) toward the second housing ( 12 ) closer than a desired spacing.