MS Pro / MS1 Distancer (MS1000 Mod)

One of the mods that can be done to either the MS Pro of MS1 headphone by Alessandro is to use the Grado 1000 ear pads on them. But to do this and make them sound good, a coupler has to be used. Typically these are called distancers.

See this thread on Head-Fi for more details.
http://www.head-fi.org/forums/f4/alessandro-ms1000-ms-ultimate-diy-modding-56k-warning-323271/

The diagram comes from the same forum thread.

The design is based on the suggested dimensions and includes 3x 1.5mm holes as ventilation.