if it were me, i'd just get a new hat. even if you get it to fit, a wool felt hat will shrink back down pretty quick. i'd recommend checking out Akubra; i've got a Federation and i love it to death. and with the current exchange rate most of them come to just a bit more than a professional reblock.
http://www.hatsdirect.com/cgi-bin/products.cgi?group=Akubra+Hats&page=1