tube 20 an aluminum alloy is a suitable material for the flexure tube 20 because of its lower modulus of elasticity and high strength a time dependent electrical signal 38 which conforms to the modulation waveform desired is applied to the high voltage amplifier 36 the output 32 and 34 of amplifier 36 is applied to the piezoelectric transducer 10 which may be a stack of piezoelectric disks a piezoelectric tube or segments of piezoelectric tubes the hardened conical points 12 and 14 are bonded to the ends of the piezoelectric transducer 10 the hardened conical points 12 and 14 fit into hardened contact points 13 and 15 respectively the hardened contact points 13 and 15 are precisely centered relative to the outer diameter of elements 16 and 18 respectively the inner diameters 17 and 19 of flexure tube 20 are made precisely concentric elements 16 and 18 are fixed to the flexure tube 20 with the tapered rings 22 and 24 there are two pairs which are axially squeezed by the screws 29 typically on both sides and the clamping plates 26 and 28 the clamping friction connection so produced permits not only accurate centering of the conical points but also provides uniform circumferential loading which cannot be obtained to the level required with a threaded connection during assembly a preload is applied to the piezoelectric transducer 10 before the assembly is locked in place elements 12 14 16 and 18 are made of a2 medium alloy tool steel because of its high yield.