Hello, I just finished assembling the Pro B printer and the rear support plate I3-a12 has 4 holes in it that are aligned with the 4 holes in rear support plate A, I3-11. There are 2 bottom holes for the 10mm threaded rods. These go through both plates. On top of these holes there are 2 holes for the 8mm smooth rod in both plates. These holes allow the 8mm smooth rod to come out from the back of the printer. Are there supposed to be holes for the 8mm smooth rods in both plates? Am I suppose to use item 20, screw locking ring on the smooth rods?
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