https://www.thingiverse.com/thing:6656341 includes the .stl file and the .blend file to edit in blender if anyone is interested.

the servo is a clip in mount and held securely but removable if needed, the design has a hole for piano wore, this usually needs drilling out though does make it easy to use various gauges of wire. switch holes are 2.4mm designed for M2 bolts with nuts & washers