maintain attachment of the cutting element to the tool in the event that the attachment means fails the retention means comprises a first surface on a side of the cutting element a mounting recess in the cutting tool in which at least a portion of said cutting element locates a second surface in a side of the mounting recess against which said first surface locates channels in each of said first and second surfaces that align so as to cooperatively define a dowel hole when said first and second surfaces locate together at least one dowel that locates in the dowel hole and means for retaining the or each dowel within the dowel hole application_number US 200913318727 A description the exemplary embodiments described and shown in the representations are generally used in relation to a drilling or cutting tool known as a hole opener or reamer this cutting tool acts to open a small diameter hole to a larger diameter and uses multiple conical roller cutters to achieve cutting of the rock or earth this exemplary embodiment relates to the attachment of those roller cutters to the main body of the hole opener or hole reamer fig1 shows a drilling tool 10 incorporating the number of cutting elements 11 around the periphery of the tool 10 in this embodiment the cutting elements 11 comprise conical roller cutters as seen in fig2 an attachment means is used to fix the cutting elements 11 to the drilling tool 10 in this embodiment the cutting elements 11 comprise an arm 21 extending from a roller cutter 22 where the arm 21 is.