Abstract: A method of assembling transducer tools for down-hole applications wherein piezoelectric elements in the tools are pre-stressed by mechanically stretching an elastic mandrel about which the piezoelectric elements are positioned and subsequently releasing the mandrel so that it contracts causing the piezoelectric elements to be captured in an interference fit in a recess in the mandrel. The method can be adapted to embodiments where the recess in the mandrel is bound by two regions of the mandrel, itself, or where the recess is defined on one end by a portion of the mandrel and on the other end by a separate anvil member positioned against the piezoelectric elements and then secured to the mandrel.