In the present embodiment, abutment structure 20 is attached to panel 11 proximate end 12, which is the leading end of seaming board 10 as previously explained, and is adjustable between {HEAD ~ a closed condition} opposing {TAIL ~ upper surface} 16 and an open condition away from upper surface 16 
opposing
In the present embodiment , abutment structure 20 is attached to panel 11 proximate end 12 , which is the leading end of seaming board 10 as previously explained , and is adjustable between { HEAD ~ a closed condition } opposing { TAIL ~ upper surface } 16 and an open condition away from upper surface 16
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