What is making my sprayer drip?

I've replaced all the O rings, so now the only drip is in the spray.  About 1/3  of the cone of spray just sprays crazy and dribbles from the hole in the top  of the domed piece that screws on.  The hole looks round to me.  I can't tell if the inside of the dome is uneven.... it's pretty small and dark in there.  I've cleaned it with Barkeeper's Friend on a Q-tip, but there is still some staining.  If the problem is inside, how would I smooth it out?

If the problem is in the male part,  what should I be looking for that might cause this?  

Comments

[blkhawk]

Could be a hairline fracture in that part that expands with the pressure inside the sprayer.

[RedneckEngineer]

Could be some meneral build up from the water. Soak it in some vinager to loosen it up and try to use a Qtip.

[mole1]

Thank you for your thought on the problem. Usually vinegar works - especially in hard water areas, but sadly it has had no effect.

[Jayefuu]

+1