I have a Niterider Minewt USB head light - great light except that the cord has frayed / become damaged leading to the intermittent illumination of the lighting unit :-((
The cable where it plugs into the light - does it come out? If yes, is it some kind of proprietary design or some standard one? If it is standard, buy a new one, cut and reconnect. You can use heat-shrink tube to water seal.
If it is proprietary cut the cable off, then carefully cut away a minimum of the plastic from the connector end exposing the wires. Resolder and again seal with heat-shrink tube. A hot-glue gun can be good for insulating fiddly areas.
Best of luck.
Cut and shut with a bit of fiddling.
Can the light be opened up?
If so, do a bit of a operation on it and cut cable, strip wires and re-solder.
I can lend you solder and iron or be happy to give a hand.
Open the light up 1st though and see.
I have repaired this particular model light previously,it is a little fiddly to do but is easily done if careful !
If you feel you are not up to the task feel free to let me know and I can do the job for you !
Ps: The wires need to be stripped and cut offset[This ensures no possibility of Shorting out between the wires],then the main Plug body ID must be enlarged to suit the "new" section of outer casing that must be forced into the Plug body !
This ensures a snug watertight fit !
if it is a case of replacing the plug on the wire I have the gear if you can get another plug.
Dick Smiths used to stock this type of stuff.
If you are keen let me know and I will bring the gear to the bike workshop on Saturday.
I'm surprised you haven't asked Sam