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647: Difference between revisions
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==Internals== | ==Internals== | ||
Unlike the threaded knob used for retaining the [[letter- | Unlike the threaded knob used for retaining the [[letter-series and 1-series plug-ins|530/540 series plug-ins]], | ||
the 647 uses a lever actuated cam mechanism. | the 647 uses a lever actuated cam mechanism. | ||
The single lever both engages and disengages the plug-in with a quick, smooth motion. | The single lever both engages and disengages the plug-in with a quick, smooth motion. | ||