Ditto what Tim said-- if you've still got a bit of screw above the barrel, that's probably the best route.
If the screw has truly been smashed flush with the barrel, then you're s.o.l.-- you may be able to drill it out with a dremel and save the tip, but the barrel will be a goner, and you'll need to rewire.
With German points, you need to be pretty diligent about checking the condition of the screws regularly, and replacing screws as soon as the start to show damage-- completely mashed screws are sometimes the result of several hits, rather than a single hard one.
I've spent a bit of time looking at some online watch-repair tool vendors ( <a href="http://www.shorinternational.com" target="_blank">www.shorinternational.com</a> is one). There are tools for extracting small screws from watches and small taps for dealing with a damaged thread (losing a $6000 Rolex to a damaged screw is far worse than losing a foil barrel). If I can learn what the thread size German foil tip screws are, and if the screw extractor tool would work on a foil barrel, it might be a solution to the problem.
-Dave
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