One blog reader, who is an artist and a builder with a form of Muscular Dystrophy said, "It's difficult to find art manufacturers that make lightweight equipment for people with disabilities."
Here's how my easel looked when I set it up to show some workshop students. It fits on a camera tripod, which allows you to control the height and slope of the painting surface.
The white thing is a DIY nylon diffuser to shield direct sun or dappled light.
Here are the front surfaces (the ones facing me as I work) laid out flat. Each panel is 5.25 inches (13.3cm) by 11 inches (28cm). The panels are 1/4 inch oak plywood finished with Tung oil.
The long dimension of each panel only needs to be about 3 inches wider than the sketchbook in order to support it when open flat and clipped. The whole thing is small enough to fit into my belt pouch when it's folded.
The palette panel (the one on the left in the photo above) has recessed Neodymium magnets to hold mixing tray or watercolor set. The triangle of magnets matches corresponding magnets on the base of the water cup.
Here's the back laid out flat. The support point is positioned close to the center of the sketchbook page on the other side. The closer it is to that point, the less the whole rig will wobble when pushed with the brush, pencil, or hand.
The diffuser gripper is made of two pieces of plywood with a T-nut on one side and a thumb screw on the other. The two pieces are held together with a hinge and grooved to hold the diffuser bar. The wedge mounting base allows the gripper bar to fold down flat when not in use.
Here it is set up with a camera extension bar coming from a second tripod. I just wrote an article for International Artist magazine about how to shoot and edit video art tutorials.
This sketch easel can be used not just for sketchbooks, but also for small paintings on panels. Here I'm working in casein on an 8x10 panel clipped to the easel.
Please send me photos with captions of your own DIY sketch easel. My design uses some of the refinements you came up with in the last round (see post called Your DIY Sketchbook Pochades).
I'll award a prize of a "Department of Art" embroidered patch to my favorite submission.
Southco adjustable friction hinge
Nalgene 2-Ounce Jar
1/4 x 1/16 inch Neodymium Magnets
Tripods: Vista Explorer 60-Inch or Velbon Sherpa 200 Tripod
Diffuser: White Rip-Stop Nylon Fabric