It sounds like you have isolated the motor from the case/base. While this may transmit less vibration to your arm while holding the base, it may allow the motor to vibrate more. While this should transmit less energy into the shelf and back up into the table, I wonder if the greater movement of the motor may transmit more vibration through the belt into the platter. If the table is suspended well to isolate it from the shelf, you may be better off going the other route and rigidly clamping the motor to the shelf, and letting the table's suspension isolate the platter and arm from the resulting shelf motions. My guesis that the coax cables worked because they are a lot stiffer than the originals, and are mechanically holding the motor steadier. Disclaimer:I do not have experience with this table. These comments are made based on my mechanical engineering background. The real test is as you say, when you actuially listen. I would definitely be interested in hearing your listening test results!!!
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