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the 30mm ID of the lens holder equals about 1.25inches, so the metal (or silver plastic) tube sticking out of each eyepiece should be roughly 30mm in diameter.
if the silver eyepiece tubes are roughly 25mm diameter, i have a feeling that somewhere in your bag of eyepieces you will find a short plastic tube that is hollow inside. its an adapter that sits between the foccuser and the eyepiece. one end will fit inside the focusser, and the eyepieces will fit in the other end. see drawing below.
jarrod.
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