Hi Dan,
Go to a local shop and ask them to flex hone or ream the seat tube,
bring the Zeus seat post with you so they can check it, but don't sand
the post that will distroy a classic beauty.
http://www.recycledcycles.com/
There are some great frame builders in that city any one of them can
do this for, you might try Bill Davidson.
http://www.davidsonbicycles.com/