On 2 Dec 2003 10:19:32 -0800, (Ben) wrote:

i just successfully threaded my first bolt, only to discover i was
threading left hand threads. aaargh!
how can i thread right hand threads while starting the thread at the
bolthead?
how can i hold the bolthead with the tailstock and center the end of
the bolt with a live centerin the spindle?
i'm thinking about grinding a tool to cut threads upside down.

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Upside down is correct. If you change the direction of feed then you
must change the rotation which means upside down tools. If you want
the same thread.