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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