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The Steeldrive II motor unit features a contactless (wear-free) homing sensor (hall-effect sensor). It is activated by a magnet attached to the moving part of the focuser. It enables precise homing and repeatable approach of saved absolute positions as well as a reference of the mechanical end stop.
The Metal Magnet Ring is attached between the eyepiece clamp and the eyepiece extension. To install the magnet ring, at first you need to remove the 2" eyepiece holder or the thread adapter for e.g.T-2,M48,orM68. It must be installed parallel to the Steeldrive II.