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There should be a finder shoe built in to the Skywatcher focuser, if it is the standard focuser. The finder holder would need to be swapped for an Skywatcher one with the matching base to fit the shoe.
There are other ways but they would involve making your own finder rings or buying after market rings and mounting foot. Also the Celestron finder seems to have a slightly larger diameter body to the Skywatcher finders, only by a millimetre but enough to be a tight fit in the holder, as I've found out.
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