Recreating a primary key

Hi,

Is there a way to re-create a primary key?

So I create tables with CREATE TABLE... PRIMARY KEY(col...) syntax. 

I later want to drop the primary key and re-create it (performance
considerations, and to not worry about exclusive table locking with a
rebuild index). 

The documentation says that primary keys are basically UNIQUE and NOT
NULL keys, but checking with pg_index, I see the "indisprimary" column
is set to true.

Any quick and dirty way to rebuild these indices?


-- 
Ericson Smith <eric@did-it.com>