i made it working,yay 
got another gas pipe thing n then went to mechanic to check which goti i need but they used L key of size 12 to move it
khair then i thought to try it,connected pipe at both ends,loss of water i.e water leakage is zero now,n its working perfectly
i dont know if its due to the head inside or the screw at top of handle as i moved that as well but that was just to adjust handle
now on pressing handle fully,it comes straight,n on releasing it starts to spread,i shot the video now so its dark but gives pretty much the idea,now wash without having to move to tap again n again,an awesome n very cheap solution 
[video=dailymotion;x16dj21]http://www.dailymotion.com/video/x16dj21_hose-nozzle-in-action_auto[/video]