An old way to restore a thread is to use a high tensile bolt with a couple of
grooves cut neatly down through the threads as a home made tap. Use a fine
hacksaw and cut deep at the nose of the bolt and getting shallower towards the
head. This would act as a third tap as it will cut away that last small amount
of material without distorting or stretching the new thread. The same trick is
used to restore a bolt thread by grooving a nut.
Andrew Fildes
afildes@xxxxxxxxxxxxx
On 03/11/2010, at 8:18 PM, Olaf Greve wrote:
> I opted to try and see if
> they would screw in, effectively forming the third tapping stage. This
> worked a charm, with a small "adjustable wrench" (called "bako" over
> here, but what are those called in English?) the proper amount of
> torque could be applied in a controlled fashion to force them through.
> After a bit, they went through easily. :)
--
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