I need to increase the strength of the vibration for the treo600 phone. When I am in silent mode the vibrator I can barely feel the vibration. Is there any add on gizmo that would fit into the SD slot that would vibrate stronger than the phone does currently?

Also looking for a belt clip for this phone that is hard plastic. I have seen several post elsewere that suggest that the clip made by Seidio breaks easily. Thanks for the help