I did the same think with the bearing ,put it in freezer for 3 hours and put the housing in oven on 200 for an hour ,when I removed the bearing from freezer it just drop in ,this is bensen rotor head I had to take appart for prerotor ring install ,when I was in it I decide to replace the bearing since it had some surface rust on it ,so I doubt that the bushing is wrong size ,I used mrc 5206 czz bearing ,the bushing is just bid big to slide it in by hand ,I had to use mallet with solid rod to remove it from the old bearing but without any brutal force. I was able to remove it without any damage ,since I live in apartment I'm not sure if any of this will work I don't want to get in situation where the bushing drop half way in and the rest will get stuck ,it might worth it to drop it at machine shop and have them take few thousands off maybe 0.002 .
I will try the same method like I did with the bearing and housing but I use the recommended method with preseting the oven to 175 and the turn it off .
Thank you guys