- Clean the rear extension housing in a suitable solvent.
Air dry the housing.
 
- Inspect the extension housing for the following:
 
| •  | Nicked mounting surfaces | 
 
| •  | Damaged sealing surfaces | 
 
| •  | Damaged front or rear bearing bores | 
 
- If damaged beyond repair replace the extension housing..
 
- Clean up damaged threads with the correct size thread tap.
 
- Inspect the machined mating surfaces for flatness (Check the mating surfaces
with a straight edge).
 
- Use a fine mill file to dress minor scratches or burrs.