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OK if you have 30mm of spare intravel I could move it back say 24mm.
It's a good idea to keep at least 1/4"or 6mm of spare intravel.
I would put all you eyepieces in especially the lower power ones and double check the in travel once it is focused.
To be honest I am not real sure what you will see if your mirror is not fully visiable.By the sounds of things you have a fairly long travel focuser on the scope .
how much spare out travel would you have and again check all eyepieces and go from the one with the longest distance out for focusing.
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