In a message dated 11/28/04 4:54:17 AM, THX0001 writes:

<< In a pinch, there may be sufficient length in the deeper, partially
tapped/untapped portion of the original tapping to complete the tapping with a plug
tap and thereby provide enough threads for a bolt up.  The rule of thumb is
that a tapped thread length of one and one half times the fastener diameter will
provide sufficient pull out resistance to the maximum torque rating of that
fastener. >>

As hard as it is to believe, I made a mistake in the above paragraph.  The
phrase "plug tap" should read "BLIND tap".

George