As you piece blocks, finger-press seams in the desired direction to help keep your work smooth. Trim points to reduce bulk.
1. Referring to Diagram 1, lay out two matching black-and-white polka dot A pieces, two matching assorted polka dot A pieces, and a plaid or stripe B square.
2. Pin one edge of plaid or stripe B square to short edge of an assorted polka dot A piece, carefully aligning and pinning marked matching points (Diagram 2). Sew together between matching points, making sure you do not stitch into the 1⁄4" seam allowances. In same manner, join remaining assorted polka dot A piece to opposite edge of plaid or stripe B square to make a spool unit (Diagram 3).
3. Referring to Diagram 4, layer a black-and-white polka dot A piece atop spool unit, aligning edge with edge of an assorted polka dot A piece. Pin together, carefully aligning matching points. Sew between matching points in direction of arrow. Backstitch at end of seam (being careful not to catch seam allowance underneath).
4. Referring to Diagrams 4 and 5, pivot the black-and-white polka dot A piece to align it with edge of plaid or stripe B square; pin at matching point. Sew between matching points in direction of arrow; backstitch. Finger-press seam allowances to the right.
5. Referring to Diagrams 5 and 6, pivot black-and-white polka dot A piece again to align it with edge of adjacent assorted polka dot A piece. Pin and stitch between matching points; backstitch.
6. Repeat steps 3–5 to join remaining black-and-white polka dot A piece to opposite edges of spool unit to make a Spool block (Diagram 7). Press completed block with an iron, pressing seams in directions that allow them to lie as flat as possible or that will enable you to quilt as desired without stitching through seam allowances. The block should be 31⁄4" square including seam allowances.
7. Repeat steps 1–6 to make 24 Spool blocks total.