"Good knob but exceptionally poor machine bolt, the one supplied did not fit the internal thread resulting in a 1.5 hour tour of local hardware shops for a replacement bolt as screwfix don't hold the knob as stock.
Alas it was not to be and I ended up ordering another knob for next day collection.
Why didn't I just do this in the first place instead of wasting time and allowing the Christmas traffic to cause a blood vessel to nigh on burst out of my already frustrated forehead?"
"This knob looks great but when I tried to tighten the mounting screw the female tread in the cast iron stripped before the anti-rotation points had even fully sunk into the softwood door. The thickness of threaded iron is insufficient."