Bowden cable replacement

[rennart]

The bowden cable on the bathroom washbasin has snapped (It was pretty old).
I'm having trouble taking it apart.
I've undone the screw fixings and WD40'd it, but I can't get the top part off.
(That's the bit connected to the plunger for the plug).

Do I just keep WD40ing and use brute strength?
What do you suggest. Any advice gratefully received.
Thanks
P

 

[rennart]

managed to sort this with brute force and box spanners,

 

[Jecs Duminy]

Brake and shift cables are only about $3.00 each at my local bike shop (over the counter sale). Cable housings can't be much more. If you are mechanically inclined what-so-ever, replace them yourself & save.