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Depends on how big it is - sounds like it's bigger than 8"?
Anyway, regardless of size, the way I was told to do it (I had to store a 17.5" for several months) was to get 4 (or more) small wedges of soft wood and gently place the mirror upside down on them. That way the mirror is facing down so no dust can settle on it and only the very edge of the mirror should be touching anything. You could clear a space in a cupboard to do this.
The secondary is easy - just make a rough tube out of paper, close it at one end then slip it over the secondary holder - no need to take the mirror out of the cell.
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