Homebrew PCBs

Hi All
Does anyone have any pics of a soldering iron tinning adapter 
they could send me.
I have read about them on the net but am yet to see a pic on one 
apparently it is a device that can be fitted to a soldering iron 
that allows one  to tin a PCB evenly and works I believe  by capillary action.
Cant seem to find any info on them at all in the UK

Regards 
Ron Priest