After disassembling your X and Y gantry you can replace your X and Y bearings as follows
Hold your desired X or Y bearing mount with one hand and use an Allen wrench to loosen the set screw by turning it on full rotation, as seen in the first image
With your thumb push the bearing through the mount, as seen in the second image
Be careful with the bearing when removing it and try not to drop it or get debri inside of it
Take you new bearing and insert it into the mount then insert an X or Y axis rod into the bearing
You bearing does not need to be perfectly centered in the mount but try to get it as close a you can
Next turn the the set screw with an Allen wrench 1/8 of a full turn and then slide the rod back and forth in the bearing
Repeat the last part of this step until the the bearing does not move with the rod, it is very important that you do not over tighten the set screw because it may cause damage to the bearing itself
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