My old frames (Gram's and other Gram's) are much older, but they have pillow "ticking" tacked to the wood. You can then pin your sandwich to the ticking (think old feather pillows, blue and white stripes) and roll from there. They used a narrow (3" - 4" ) strip of muslin and zigzagged it along the sides (over under over under) and pinned the sides to the muslin strips to tighten the sides.