There is a sheath (1) covering the knob seat (2) fitted to the door leaf, with the shoulder (4) fitting tightly into an accurately-made circular hole in the door leaf. The part of the seat (2) pointing towards the inside of the leaf has an internal taper (6) matching the external...
There is a sheath (1) covering the knob seat (2) fitted to the door leaf, with the shoulder (4) fitting tightly into an accurately-made circular hole in the door leaf. The part of the seat (2) pointing towards the inside of the leaf has an internal taper (6) matching the external...