Variable height servo mount

A mount allowing you to screw a servo (with m2.5 screws into 2 backer plates) with variable height. combined with a slotted base you get 2 axis of adjustability. the holes underneath are ready to be tapped to m4. The servo it's modeled for is a jr NX 3425 (Sbus) http://www.jramericas.com/234698/JRPSNX3425/
which has a hole-center-distance of 1.525" or 38.72mm in the long direction.