I can offer internal battery changing service for older cart based games. This will increase the life of the game by 10+ years and you will never have to worry about your saved game from disappearing.
Please pm me if your interested.
Other services that I will offer soon are adding LED lights to systems (TG-16,SNES2, and Atari systems), adding A/V Jacks to systems (TG-16,Jaguar, and Genesis), and overclocking the Genesis.