as steve says, use the locking nuts.
You will need to buy a vikan/facelift thread adaptor from cleantech (6 quid). this will allow you to fit an angle adaptor & other brushes but without the facelift goosneck (most brushes will fit this thread). Use JG type pushfit fittings to make a re-connectable split in the pipe, this will allow you to easily change brushes (cleantech also sell these, couple of quid).
Hope this helps, any other questions just ask, had my facelift 8 months now, brilliant pole.
tony