Couple of photos showing a compensator complete with grease nipple packed with grease while being assembled on the bench and a compensator housing showing the cutaway on the top for the steering rack and the hole that was drilled for access to the grease nipple.
Hope this helps.

Attached Images
Compensator-6028.jpg (305.53 KB, 201 downloads)
Grease packed compensator c/w nipple
Compensator-6027.jpg (245.29 KB, 201 downloads)
Drilled compensator housing