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The secondary mirror cell is threaded into a retaining ring which is on the other side of the corrector. Usually there are a couple of spacers on each side of the glass. Make sure you put the spacers back in the same side. The secondary should have a line at the back and that needs to be in line with the corrector (sometime an X mark in the glass). This mark needs to be at 3 o'clock looking at the scope from the front usually inline with the focusing knob on the other side.
Putting the corrector back is a no brainer. Just mark the edges. Make sure you know which side is in and out. Lateral position is not that critical. What is critical is the orientation of your secondary in relation to your corrector plate and the primary. Just 5 degrees out and you might not be able to reach focus with your scope. Also do not tighten the corrector outer ring. Just contact, no pressure. That's it. Hand tight, barely touching.
Other than that that 's pretty much it.
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