Anet A8 Z Rod Top Bearing Support

I found that the stepper motor link to the screw gives the Z screw rod a little to much movement so I have installed a simple fix which is a variation on loads of simlar fixes out there.

I brought two bearings in carriages from Ebay:

Product Name : Pillow Block Bearing Block
Model : KP08
Type : Pillow Block Mounted Bearing Bearing
Size : Inner Diameter: 8 mm / 0.31",
Outside Diameter: 21 mm / 0.83"
Total Size(Approx) : 55 x 28 x 13 mm / 2.2" x 1.1" x 0.5" (L*W*H)
Mounting Hole