Eliyahu Shahar mentioned that he plans to dowel the hole he extracted
the bent screw from.  I would just suggest that there are other ways to
do it that are far better, since heavy screws do not hold well into end
grain -- which is what dowels are.  Such a repair will self-destruct
quickly.  Don't do it.

Where Eliyahu lives, he probably can't buy everything that we have
available here, but there are just as good alternate ways of fixing
a partially stripped hole.  My suggestion is steel wool filled slow dry
epoxy (which has permanently held many a pedal lyre broken off from
rotating a piano down onto a skid board) or a plug cutter that will
bore out cross-grain dowels for the purpose (a good solution), or many
other products one can find to stuff holes with when you still have the
sides of the original hole to bolster.

Craig Brougher