Install 2 608 bearings with a M8x35 SHCS, M8 washers, and a M8 nyloc nut.
Note, there is no washer under the head of the bolt.
Tighten the bolt all the way down.
Attach X End Idler to the X End Plate using 3 M5x10 SHCS with M5 Washers.
Note orientation of X End Idler.
Attach the Double Bearing Holder to the X End Plate using 4 M3x12 SHCS and M3 Washers.
Note the orientation of the double bearing holder.
Leave the bearing holder loose at this point.