On Thursday, November 21, 2013 7:57:17 PM UTC-8, OldGuy wrote:
Electronic flash has corroded electrical contacts. Duracell AA

batteries leaked. The contacts are molded into a plastic holder and

cannot be easily removed.

Probably the little springs are steel, with a bright nickel or
chrome plated coating (sometimes copper). If the plating has
come off, your best replacement would be...
solder.

Clean, flux (an acid flux, like for stainless steel, works best) and
then tin the spring's contact end with a soldering iron, using
tin/silver solder. Then, of course, rinse the area (to get rid of the flux).
Steel isn't a great conductor of heat, a second or two with the
soldering iron won't melt the plastic.

On Thursday, November 21, 2013 7:57:17 PM UTC-8, OldGuy wrote:

Electronic flash has corroded electrical contacts. Duracell AA
batteries leaked. The contacts are molded into a plastic holder
and cannot be easily removed.

Don't use acid -- use household ammonia, followed by an alcohol flush.

If this doesn't fix it, go to Duracell. They have a "no-leak" warranty, and
will repair or replace the unit. This happened several years ago with my
dictating machine, and Duracell made good on its warranty.