Correct bearing alignment is CRUCIAL. Proceed carefully and make sure that both bearings are as close to the center of the Y-carriage as possible and do not touch any pocket edge.
⬢Unlike the previous single-bearing, position the bearings as close to the center of the Y-carriage as possible. Beware, the bearings must not touch the edge of the pocket!
Incorrect positioning: the bearings must not touch or overlap the edges of the pocket as shown in the bottom of the first picture.