Find this plate. This is the bottom plate.

  First, you need to find out the orientation.
  Place the plate in a way so the big hole in

  the middle is facing to the right, as shown on the picture.

  On this picture its' bottom side is shown.

  In the next step you will determine the orientation of your part.

  Find the Y stage plate. Align like shown.

  The very big hole in the middle should be on the right

  and the top right corner should have two big holes.

  Put the Y stage plate onto the bottom plate.

  The long holes on the bottom plate have to match the Y stage plate.

  If not, turn the bottom plate around.

  This picture is showing the bottom left side.

  Here we have another long hole that has to match the Y stage plate.

  When this matches, remove the Y stage and set it aside for later.

  The bottom plate now lies on the actual bottom side.

  Now, find the 4 rubber feet and 4 M8 nuts.

  Put these to the hole in each corner of the bottom plate.

  Insert these from the bottom, tighten them with a M8 wrench.

  Find this part (cut from aluminium).

  This needs to go to the top side of the bottom plate.

  Mount it using M4x12 bolts and hexagonal nuts.

  Note: We used a printed one because that part

  hadn't been cut for our photo model.

  The part you just installed will hold a

  6001ZZ bearing (the big one) in place.

  Note that the bearing may fall out when

  installing the bottom plate to the body.

  Just put it back in if it does.