Cpk and Stringreen are right. Use a little dab of white lithium grease on top of the bearing. Then let the platter slide down by itself under its own weight. You are experiencing hydraulic pressure due to the tightness of the bearing and chase assembly. The air in the chamber is very slow to escape. If it is that tight it should slide down easily without banging the bearing. You do not want to let it go down hard on the bearing.
Enjoy
Enjoy