Hi Ralph - I'm new to Enfields, but old to BSA. For longevity, lube the cable and pivot lead and the lever. I use one of those rubber cable lube attachments that accepts the tube from a can of 'Cable Lube'. Thoroughly lube the pivot with grease. Without the lubed pivot, the lever can turn the cable end against the cable. That really shortens cable life. Later setups added a plastic sleeve in the pivot to prevent the cable end bending.
If you doubt your cable's condition -- you can keep your spare pre-installed and tied to the working cable. When your cable breaks, just connect the ends of your replacement, adjust and you're rolling.
Cheers,
Bill