"I notice that another reviewer has stated that this dimmer unit will not fit onto a faceplate if used as a direct lock nut style replacement. Please be aware that this dimmer is modular, its meant to be used with a modular style clip-in faceplate, not on normal style locknut dimmer faceplate."
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Review 2 for Varilight Z0GP400W 2-Way 400W Dimmer White
"The thread around the spindle does not protrude far enough through a standard face plate to get a nut on. There must be less than one turn of thread available. I don't know how this design ever made it from the drawing board to the factory. (I did wonder why it was so cheap.) Screwfix were very good about refunding me though."