A Long Cover Hook is a condition where the cover hook length approaches and/or exceeds the recommended guideline.

POTENTIAL CAUSES:

• Shallow countersink caused by worn or incorrect seaming chuck.

• Short body hook caused by insufficient lifter.

• First operation seaming roll set too tight.

• First operation roll profile too narrow.

• Overly tight second operation seam.

• Excessive seaming stock.

SUGGESTED REMEDY:

• Replace seaming chuck.

• Increase lower lifter spring pressure to obtain proper body hook.

• Adjust first operation roll for proper seam tightness.

• Replace with proper first operation roll profile.

• Reset seam to 90% tight.

• Discuss with end manufacturer.