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Last Updated: Wednesday, September 15th, 1999, Created: Wednesday, September 15th, 1999
One way is with a product called Screw Grab. It is a gritty liquid that just fills in the slot and gives the screwdriver a chance to get a hold. It doesn't always work, but is a lot easier than drilling the screw out, so it is worth the first try.
You can buy Screw Grab from Lee Valley Tools
Article 339