A roller 40 applies {TAIL ~ a force} to the peripheral edge 16 to achieve {HEAD ~ approximately a 60° angle} in a pre hemming step 
A roller 40 applies { TAIL ~ a force } to the peripheral edge 16 to achieve { HEAD ~ approximately a 60 ° angle } in a pre hemming step
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH