| 1. A brake support. | 
 
 | 2. The lock screw 17 and a disk 13. | 
 
 | 3. Screws of 18 fastenings of a guard through apertures in a nave. | 
 
 | 4. To develop a guard 11 so that it was possible to scissor a narrow crosspiece round an aperture. | 
 
 | 5. To deduce a guard through a nave flange. |