bypassing fob?

I have a piaggio skipper 125, the guy i aquired it from, has lost the fob for the immobilser!! its a round shaped fob size of a penny. I think before you turn the key your supposed to make contact with this to its oposite other on the scoot!! I have the flashing led..and i have the master key, once i turn that the beep is their for so many seconds. I press start sweet F/A. Can i get around this without replacing ecu...any advice other than scrap it....much appreciate