Assemble Quilt Center
1. Align long edges of two tumbler pieces; the ends should be a bit offset so the pieces will match at the 1/4" seam line (Diagram 1). Sew together two tumbler pieces, being careful not to stretch edges. Press open (Diagram 2). Continue adding tumbler pieces, joining 20 total, to make a row (Diagram 3). Press seams in one direction.
2. Repeat Step 1 to make eight rows total, alternating pressing direction with each row.
3. Join rows, carefully matching seams, to make quilt center. Press seams open.
4. Trim quilt center to 32-1/2x60-1/2" including seam allowances (Diagram 4).