a. begin with the double row of slits; insert tabs in outer row of slits, from beneath.
b. bend tabs round and down. Insert all tabs; some of them can be bent back underneath to help hold the rest in place while you work.
c. edge seam tightly together.
d. fold back all tabs underneath and clamp tight.
- use metal handle of tin cutters to press seam flat against hard worksurface.