How to get network cable up/down cavity?

[john999uk]

I realise putting mains cables in a cavity is a no no but I need to get a cat5/6 cable from downstairs to upstairs in a dorma bungalow and thought the cavity might be a good route?

So does anyone have any tips to get a network cable through a cavity?
Cheers for any help.

Forgot to say the cavity has no insulation.

 

[Squid]

Get yersel' some proper rods, man!

Ball cocks...........

 

[Gavin John Hyde]

When fishing out the weight and chain in a cavity or void use some rare earth magnets. Dont buy the gecko tool for 40 quid. Buy a dozen washer style earth magnets and attach them to a old plastering trowel. Works a treat to move things along to the hole!