An alternative to using a dead motor to get the critical angle was posted around 2005.
Here's a later
2007 discussion of all the facts, with a link to the
pictures PSB posted.
Quite simply, you
- tilt the top of your pole toward true north,
- at the appropriate angle for your latitude,
- set elevation on dish mount to hit your true south satellite,
- then spinning the dish's mount on the pole moves you from bird to bird.
The convenience is, you can mark your pole, and you have hardware you can lock in place on a given satellite.