Step 5: Use scrap material and expensive machine downtime
With a bit of CAD, some leftover 8020 structural aluminum, a few jet machined connectors and blades ...
(download the zip file full of all the CAD drawings)
I designed it to use abrasive jet machined aluminum connectors and extruded aluminum bars. The blades were also jet machined from stainless steel and sharpened to a 90 degree angle by hand. The flexure is polycarbonate. You could accomplish the same thing with scrap steel from a bed frame welded together.