I've used timeserts in lieu of helicoils before. They are a solid, threaded
insert, rather than a coil of wire (helicoil). The timeserts were used to
repair a pulled headstud in a magnesium engine case (old Porsche engine), and
were the recommended method over a helicoil.
My (very limited) understanding of the timeserts is that somehow the threading
of the inserts help prevent the timesert from backing out (which a helicoil
might do). Also, they are a solid insert, and less likely to break than a
helicoil, which is essentially a coiled wire.
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