| 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. |