Therefore I do not agree a rifle, silencer, poker or cattle prodder would get too hot to hold for the 5 minutes Fowler said was needed in order to burn Nevill's back.
My hand would be several feet from the plate when holding one end of a rifle, poker or cattle prodder on an aga plate.
A silencer is a bigger & more solid item than a knife. So only one end would get hot in 5 minutes.