How do you determine the nodal point when using a cheap tripod?

Question: How do you determine the nodal point when using a cheap tripod!?
Best Answer - Chosen by Asker:

try this link :)

http://www!.edb!.utexas!.edu/teachnet/QTVR/!.!.!.Www@QuestionHome@Com

I don't know if *I* could find it with an expensive tripod! Fortunately, I do not do panos!.

steveWww@QuestionHome@Com