Strong heating of the body comes from low exposure minus the wires.
Try to put under the NR wire wick in metellichesky channel in two - three wire. (from the spiral - down - until the end of the ceramic housing, then bend - pave up to the beginning of the slot in the keramchashke, bend back and forth to the ends of the ceramic housing.
Above presses wick.
So you provide a very good contact with no leakage current epetrillo.
Try to put under the NR wire wick in metellichesky channel in two - three wire. (from the spiral - down - until the end of the ceramic housing, then bend - pave up to the beginning of the slot in the keramchashke, bend back and forth to the ends of the ceramic housing.
Above presses wick.
So you provide a very good contact with no leakage current epetrillo.