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If the 1st operation seam is too loose, the Cover Hook will be away from the can body having a noticeable gap all around. There may not be enough of the cover curled up inside to create a sufficient Cover Hook and Overlap.

Loose-1st-Operation-Seam Loose-1st-Operation-Seam-body-wall-fractures
Probable CauseSuggested Remedy
1st Operation Seaming Roll too looseTighten 1st Operation Seaming Roll. See Parts List & Instructions or Service Manual for adjustment procedures
1st Operation Seaming Roll groove profile wornReplace the 1st operation Seaming Roll
1st Operation Seaming Roll groove profile too wideReplace 1st Operation Seaming Roll with a narrow groove profile.
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