My Sonicare was also wobbly. I looked up that my HealthyWhite powerhead model HX6730 was covered under a 2 year warranty. I called the warranty number 1-800-682-7664. I got someone right away and a new toothbrush base is coming my way for free. I just have to send the broken one back after receipt of the new head. Thank you Phillips Sonicare!
http://download.p4c.philips.com/files/h/hx6732_02/hx6732_02_dfu_aen.pdf
Holly
July 2010