You could try a set of welding torch tip cleaners that come in a little
fold up set along with some contact cleaner.
Another thing to try would be to crimp the pins slightly with needle
nose pliers to make them tighter in the socket or even put a slight
bend in the pins carefully to avoid breakage.
Dielectric Grease, found at most hardware or auto stores.
Just wipe the pins with it.
It's about $3 US for a tiny tube, but it will last a long time since you
just wipe the contacts with it.
It is stated as non-conductive, but it is designed for, and has been
used for years, as a corrosion protection for all electrical contacts.
Only works where you have a good contact to start with. It's a cheap
Chinese peice of crap, so if it lasted 6 months he got his money's
worth. Time to curb it.
Sadly, just about every CCF lamp you can buy in North America is a
cheap peice if Chinese Crap.
It works great when the contact is good from the start. The electrical
contacts move enough of the grease out of the way so the contacts can
make a good connection. The grease surrounds the connection keeping out
humidity, oxygen, and other gases so it doesn't oxidize, pit, corrode,
whatever. It's preventive maintenance, not a fix.
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