Allows a 13" Macbook to be attached to the back of a South Western Railway (UK) long distance (diesel, class 158/159) train seats.

Print 2 of these (rotated 90 to be flat on print bed).

Fold down the mini table out of the back of the seat in front, clip these under the keyboard of the Macbook, then insert the top of the screen into the recess in the back of the seat, and the square lugs will sit into the lipped table and be held by the weight of the laptop.