I am having trouble changing a washer on my "Ultra Viscount" taps - like http://www.victorianplumbing.co.uk/Viscount-Range-Chrome-Basin-Taps-X381.aspx. The shroud is perfectly round, and I cannot seem to shift it either by wrapping it in sticky tape (to protect the chrome/prove a grip) and using pliers or by trying to lever it up. The very top of the tap can be unscrewed revealing a small screw inside, but removing that has not helped to free things. I am as stuck as my tap and would appreciate any advice!