An addendum, if I may.
I came across an article in a 1989 issue of Threads magazine (Aug/Sept, No. 24) by Rosalie Hamer called Banishing Needlepoint Bias.
According to this article, the essential points for reducing distortion in needlepoint canvas, greatly abbreviated, are:
- tension, a firm but loose stitch
- a stabbing motion if a stitch goes straight **under** a canvas thread or diagonally over more than one
- avoidance of continental stitch - use cross or basketweave stitch instead
- yarn. The heavier the yarn is in relation to the canvas mesh, the more distortion prone the work will become.
- a firm, well sized canvas of good quality
- working on a frame. One of the advantages cited about using a frame is that crushing or over-working a canvas breaks down the sizing and can make it too soft to hold its shape. If worked off frame, the unworked canvas has to be constantly rolled and unrolled to stay out of the way. Frames eliminate excessive handling.
She also blocks face side down and irons on fusible interfacing to the wrong side to keep it in line, but I can't imagine doing that on a rug.
It made sense to me, and I thought I would pass it on. Dora