Can I fix my vibrating electric mower?

I have a black & decker cordless lawn mower ( http://www.amazon.com/Black-Decker-CM1936-Cordless-Removable/dp/B002YK4UZU/ref=sr_1_1?s=home-garden&ie=UTF8&qid=1306888246&sr=1-1 ) and i hit this stupid metal spike out in the back yard, and now the mower vibrates like crazy. Is this something I can fix myself?