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The thread is M55.9 and a finer pitch than the M56 used on the Chinese scopes.
@ Richard, be aware that unless you change the tube to the shorter 105mm one from the CSV, using a 2" diagonal might make it difficult to get to focus with the FS60 focuser.
I got it to work with the shorter tube with about 2mm to spare. Some eyepieces would not come to focus at all till I changed to a prism diagonal.
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