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Removing the corrector plate on an SN10 is very straightforward.First ensure you have somewhere to support the corrector plus secondary , i have done this using a container that supports the outside of the corrector cell with sufficient depth to accomodate the secondary mirror .Then place a length of white electrical tape on the ota close to the inside edge of the corrector cell , place a second length of tape alongside the first on the inside edge of the corrector cell. Make fine pen marks across the two tapes in several places to enable accurate placement of the cell on reassembly. Now undo the 4 screws holding the corrector and carefully pull it out and place it on the container. As far as replacing the focusser im sure someone else can advise you.
regards philip
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