- 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 | 
 
- Replace a cracked 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.