There is an interesting thread on piezos at http://www.talkbass.com/forum/showthread.php?t=184648 In the thread, Rick Turner stresses the importance of coupling the piezo element to the bridge. I noticed that the D-Tar pickup installation instructions (http://www.d-tar.com/ac_double_bass.shtml) suggest double sided tape or crazy glue. I have an older Fishman piezo which I use with the small metal clamps that were originally sold with the pickup. I have heard that the application of pressure on the piezos reduces its ability to respond to vibrations. What is the best method of coupling such pickups to the bridge? Does the coupling method make a difference for arco or pizz playing?