Hans Quistorff wrote:Tensioning the canvas on the frame? [...] the ends put into mortises in the frame made a bow that held the center of the tarp tight.
I think that's a million-and-a-half dollar suggestion. Thank you...!

"We carry a new world here, in our hearts..." --Buenaventura Durruti
"Don't wish it were easier. Instead, wish you were better." --Jim Rohn