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