Cold supatap in neighbours house is extremely stiff to turn - top nut comes undone easily but even with severe brute force the body of the tap will not contine to rotate as apparently is should do to allow the body to drop away from the fixed part.
I've tried working it backwards and forwards, soaking it in penetrating oil as best I can through the undone top nut, but it just goes very solid when the instructions imply it should just undo.
Am I missing something?