Knoocking???
Deltadash from Ecutek. Or make up some det cans using copper pipe - squash the end, drill a hole through, bolt onto the block and then put a stethoscope tube on the end. There have been other concoctions using a piezo transducer and amplify - see on http://www.google.com/search?hl=en&i...utospeed+knock
[Edited by john banks - 5/20/2002 4:29:41 PM]
[Edited by john banks - 5/20/2002 4:29:41 PM]


