How to minimize damage from pitted cones? While working on a old 60's Raleigh I found that there is slight pitting on one of the cones on the front hub (rest of the hub is good).  Ideally I would replace the damaged part and move one, but spare parts for these bikes are becoming difficult to find.  While I did find a replacement this time, there may be a point that I will not.  

So given that one can't fix this properly, what can be done to ensure that damage is minimized?  

This will also cause my bearings to wear out faster, and rules of thumb to follow?

In my case these are the oil lubed hubs and I plan on sticking with that, but if grease would work better, then I'm ok with that too.

Here is all the damage the current cone has:
I would recommend doing two things:

Reassemble the hub with the thickest grease you can find (within reason). It might slow you down a little, but it will help the bearings last as long as possible.

Make a mark on the back side of the cone that corresponds to where the damage is. When you're putting the wheel on, rotate the axle so that the damaged side of the cone is facing up. Then (assuming you adjusted the hub perfectly), there will be no pressure at all on the damaged side of the cone, and all the pressure on the good side.