9/16″ (14.00mm) Mortise Chisel Bit Only - Conway Saw ...
Place the chisel into its socket in the attachment. Put a coin about 1/16″ thickness (such as a 2 pence piece) between the face of the socket and the shoulder of the chisel being pushed fully home, tighten down on the screw to hold the chisel in place. Now fit the bit into the drill chuck and push it as far as possible into the chisel and secure.
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