A retrofit assembly for a tool post adapted for rapid attachment and detachment relative to the compound rest of a lathe for adjusting the positioning thereof and for the presentation of a tool holder relative to the tool post consisting of a single operating body for tightening/loosening the tool post relative to the compound responsively to the turning of a stud on a screw means and for tightening/loosening a tool holder relative to the tool post responsively to the driving force of a manipulating device.
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