44b33013_ble_Seam_Troubleshooting_Guide__Suggested_Remedy
[Probable Cause] Can Feed & Discharge Rail improperly aligned [Suggested Remedy] 
On 41L, 61H, 62H, 80L, 81L, 100L, 101L, 120L, 121L, 140S & 180S Seamers; Check position of the Can Feed & Discharge Rail. If the rail is positioned too far in back of the pocket at makeup, the can will rise pushing the Can Flange Guide mounted or machined onto the Cap Guide Section Outer.
Knocked Down Flange | Cause & Remedy | Double Seam Troubleshooting Guide
Suggested Remedy