Cutting tool holder and a cutting insert therefor

A cutting tool holder adapted for mounting thereon a cutting insert having a top face, a bottom face and formed with an insert bore having an inner surface extending between the top and the bottom faces;

• the holder comprising
• a seat comprising a bottom surface and at least one side wall angled with respect to the bottom surface, a seat bore with a bore axis having an open end at the bottom surface of the seat, and a securing mechanism for securing the cutting insert in the seat,
• the securing mechanism comprising
• a securing pin received within the seat bore and
• a body with an outer surface extending between a proximal end and a distal end of the body and defining a pin axis therealong, and
• a displacement arrangement separate from the securing pin, the displacement arrangement adapted to mechanically engage the securing pin, such that displacement arrangement displaces the securing pin along the bore axis of the seat bore between at least a first, mounting, position in which the distal end protrudes from within the seat bore through the bottom surface into the seat to a first extent from the bottom surface of the seat to allow the cutting insert to be placed within the seat, having its bottom face aligned against the bottom surface, and a second, securing, position in which the distal end protrudes from within the seat bore through the bottom surface into the seat to a second extent from the bottom surface of the seat that is greater than the first extent so as to engage the inner surface of the insert bore, thereby securing the insert in place.