Here's an easy design for a Print Mounting Positioner you can assemble in just a few hours for under $50. This is suitable for up to 18" mount boards, but you can easily build one that goes up to 24". This does not give you the bottom weighting like the Falcon Print Positioner, but that's an easy workaround as you will see. List of materials: 3/4" piece of MDF cut to 19"x24" (Home Depot) Everbuilt screw on bumpers (Home Depot) (2) 18" Center Finding Rulers (Blick Art Supply) (1) 18" Heavy Duty T-Square (Blick Art Supply) Quick version: 1) Sand, prime and paint the MDF board. If it is unfinished it tends to be dusty. I had some gray paint handy which makes it easy to see the edges of the mount board. 2) Screw the bumpers onto the back. 3) Use a metal framing angle and check to make sure you have at least one perfect 90° angle between the left edge and bottom edge. Now use the t-square against the left edge, epoxy the bottom ruler in place, making sure that it is perfectly flush against the t-square. Allow to dry. 4) Now invert the second ruler and epoxy to the arm of the t-square, making sure the center mark aligns perfectly with the bottom ruler and that it sits flush with the edge of the t-square. (I used another metal ruler held vertically to nudge it into place.) Allow to dry. To mount a print, use the bottom ruler to center the mount board by making sure the numbers match on the left and right sides, then use two small pieces of masking tape to hold the board in place. Create a small shim with some mat board to give you the bottom width of the mount. Push the print down to this mark, then use the top ruler to center the print. Tack and press! All done.