FWIW - Some people (after screwing the new plug wire onto the little metal "stud"), take some high strength tape and secure the wire to the plastic case iteself....Then you can take some RTV sealant and use it over the taped joint to waterproof / weatherproof the connection.....this helps to make sure the wire is physically secured to the CDI box itself and that water/moisture won't be able to cause problems in the future.....probably very important if you use your bike for daily transportation.
Andrew