Now that you are familiar with the basic calculations,
take another look.

This time pay attention only to whatever is being
assumed at each step of the way. How much would the final
number be altered by making changes in the various working
assumptions.

For example: what if another figure was used to
represent the depth of the bulge?

Which assumptions should be updated, based on
information available now that was either unavailable in the 1950's
or radically different then?

How do those changes alter the final numbers?

How do different numbers impact the overall pole-shift
argument?

How large is the role of isostacy in these
calculations?