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Many people do not know how the "locking screw" on these TelVue eyepeices work:
This 12mm Nagler can be used in both 2" and 1.25" EPs. In the 2" mode, the locking screw is removed and the EP is used like any other 2" EP. In the 1.25" mode, the locking screw is wound out and the EP is inserted into the 1.25" focuser with the locking screw of the focuser made to slide into the slot in the EP. The EP's locking screw can be removed and the locking screw of the focuser is tightened, or if the focuser's locking screw is too big to fit in the slot, too difficult to access, or for added security, the EP's locking screw can be used instead.
Please see the picture below of the way that the EP's locking screw can be used.
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