On Aug 18, 12:45*am, "Michael A. Terrell"
wrote:
Fred McKenzie wrote:

What about threading tiny self-tapping screws into the holes in the
rivets that connect the lugs to the contacts?

* *How are you going to keep oxygen out of the threads?

If the screws are big enough, they will be in direct contact with the
other metal. That should last at least 10 years which is much more
than the life of a typical child's toy the OP described.