I changed the wire on mine. C&H did not recommend it but sold me the parts anyway. The wire is glued in with special non corrosive silicon glue. Its easy to remove. You have to fish the coil out of the case to get at it. That also is glued in with silicon glue. Just be gentile and take your time. Replace the wire and glue it in with your favorite glue, then put the assembly in the special heatshrink tubing C&H will provode with the new lead you bought from them. I put my coil back in the case without glueing it. I just jammed it in with some foam rebber to take up the space and keep it from moving in the case.
Its been flying for about four months now with no problems