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Ummm not sure I understand the question.

For the Y Axis, I removed one bearing on the right side (viewed from front of printer), and moved the second to the provided holes in the center of the right side. Don't think it matters.

For leveling the bed with 3 points, I removed the right rear thumbscrew assembly, Then leveled the bed. I have a 13mm aluminum tube that I use as a "feeler gauge". I adjust the the three thumbscrews until it just slides between the bed and the Y carriage on all three corners.
Then adjust Z Stop (I have this: https://www.thingiverse.com/thing:928008).
I then Zero Z stop to the FREE CORNER, then adjust back and forth on all four until it's level everywhere.

I can now print this: http://www.thingiverse.com/thing:2109700 and it sticks everywhere.

WANHAO I3 Adjustable Z endstop REMIX
Bed Flatness Test Monoprice Select 170x170mm