Sounds like you mucked up the impeller. The reverse cable should only take you about half an hour to replace, very simple, very easy. I would suggest giving Jack at MPD a call.
Marine Performance Designs
1760 Monrovia Street. Unit A-7
Costa Mesa, California 92627
Contact : Jack McClure
Phone : (949) 631-2040
e-mail : jmcclure@pacbell.net
www : http://home.pacbell.net/jmccl