Just checking to see how this went. I noticed in your first post that you weren't using the SOS with the TRG. Before I changed to the standard slide and string stop, I shot my Onza for experiment's sake with out the SOS attached to the TRG, and I know exactly what noise and vibration you are talking about! It sounded like a guitar with a loose string! If you haven't talked to customer service and had them replace the TRG/SOS combo yet, I would suggest you do so, but until then I'd definitely put the SOS on the TRG... and good luck!