{HEAD ~ The abutment structure} is attached to the seaming board proximate one of the ends, and is adjustable between a closed condition overlying the upper surface and {TAIL ~ an open condition} away from the upper surface 
is adjustable between
{ HEAD ~ The abutment structure } is attached to the seaming board proximate one of the ends , and is adjustable between a closed condition overlying the upper surface and { TAIL ~ an open condition } away from the upper surface
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH