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Sheared-off screw head
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ahofle:
True, but if the bit is small enough would it really matter?  It's basically just digging into the metal to grip it.  Only question would be if they make a small enough one.
Nannuu:
The screw removal is only for stripped screw heads, don't try that one.  And don't try to drill out from the top.  In plywood the bit will most certainly pop off to the side of the screw shaft and make a nice nasty hole right next to it in which case you still won't get the screw out.

Go from the bottom.  Once your in far enough, grab the end of the screw with some vise grips and slowly try to twist the screw until it comes through the bottom.  This can be tricky since you need a lot of pressure from the grips to twist the screw, you might actually damage the shaft to the point that twisting will just shear the bottom of the screw too, leaving an even shorter shaft in the plywood.  That's what I'd try though.
krick:
This guy has the same problem with his guitar neck....

http://p082.ezboard.com/fguitarsbyfenderfrm20.showNextMessage?topicID=1542.topic

And here's the screw extractors one of the posters referrs to...
http://www.stewmac.com/shop/Tools/Screwdrivers/Screw_Extractor_Set.html
PetitMorte:
*THAT*'s the ticket!  Those buggers work really well.
krick:
Someone with the same trouble.  A sheared off screw on a pinball playfield...

http://groups.google.com/group/rec.games.pinball/browse_frm/thread/ac79b0b567e4387d/56dd3f368fbc8e7d
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