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I will add few things:
1- There are infinite positions for the secondary mirror which will give perfect laser reflections for both the forward and return beams but only one of these positions is optimal. In the first animation, the laser beam reflections will look perfect for the setup in each frame.
2- The optimal secondary mirror position is when the secondary mirror edge coincides with the primary mirror reflection edge. You might need to move your eye further away to line up both edges. See the second attachment.
3- If one of the secondary mirror 3 set screws becomes tight yet you need to tighten it even more to move the laser beam, then you will need to loosen the set screws and rotate the whole secondary mirror by a small amount. There is a relationship between rotation and tilt. You can compensate for some rotation by tilt and vice versa. Therefore, when you run out of tilt then you will have to rotate to continue your secondary alignment.
4- When you start with the laser collimator, it is recommended to rotate the laser collimator back and forth while watching the laser on the primary. You will notice the reflection dot on the primary mirror will trace an arc. Stop when the laser dot is closest to the primary center. See attachment.
Jason
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