Have you notice how stretchers are these days. I've had to send several batches back because they were so bent and twisted. A couple of months ago I way building a 3 by 4 foot canvas when the figure joint broke on the long side. I don't like painting on big panels. I like the resistance of a canvas. The time it took to have the stretcher swapped I forgot what I was going to paint.
I don't like big panels. I've made strainer frames, stretchers without keyways, they can't be made taught enough.
Does anyone know about buying a jig to cut keyways.