How can I move the Tomcat manager application to a different port from Solr?

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http://serverfault.com – I have setup Solr on a Ubuntu server and can reach the "Tomcat Web Application Manager" application via http://localhost:8080/manager/html and execute solr queries via http://localhost:8080/solr/core_things/select/?q=name:bloggs. How can I get the manager application to run on a different port than Solr itself? (I have setup http authentication for the manager application, however I'd prefer it if the manager application ran on a different port which I can then lock down with stricter firewall rules for better security) (HowTos)