Hello,
if you don't follow the recommendation above.
For reassembling, "glue" your bearings with a lot of thick grease,
to hold them at the right place. But, i would go the way as
CBJunkie and dpen said.
By the way, there are 19 1/4-inch bearings at the top and at the bottom.
There would be enough space for a 20th but there are only 19 to avoid
rubbing
nippon