Thanks Stig and Ken. I'll ask around the family for cheap knives, or even buy some. I don't possess any<g>. I'm confident I'm right about the Ezylock though. Yes, when it's working a gentle clockwise push on the wheel releases it. I was fortunate in that I had a plumber round this morning on another job. He is a big lad but it took him some serious effort with a huge pipe wrench to undo it. If a gentle clockwise push releases the nut then stopping the stone dead is giving it a tremendous tightening torque - just ask my plumber! I think that what I need is for the HK-50 to become available over here
Gerald.
Gerald.