in fig6 the air cylinders 38 are then actuated to push the folding plate 26 forward over the channel 12 whereby the web material is positioned folded within the channel 12 the air cylinder 66 is then actuated to draw the pivot arm 64 rearwardly such that the clamping fingers 28 are simultaneously pivoted or moved forwardly toward the channel 12 subsequently the air cylinders 70 are simultaneously actuated to force the tang portion 78 of the clamp fingers 28 downwardly through the slots 46 in the folding plate 26 and into clamping engagement with the webbing material 11 adjacent to the fold line thereof as depicted in fig7 with the webbing material 11 thus clamped in place within the channel 12 the air cylinder 38 is actuated to pull the folding plate 26 upwardly out of engagement with the webbing l1 while the clamping fingers 28 remain in position to clamp the folded webbing 11 the thus folded webbing defines a pair of free lip portions positioned in facing relationship with each other and extending forwardly of the clamping fingers 28 an operator may then manually insert a length of flexible netting 13 between the lip portions starting at the leftmost end of the webbing 11 as seen in fig8 referring to fig8 as the netting 13 is inserted within the webbing l1 the operator may actuate a foot pedal not shown to thereby power the motor 104 to draw the progressive linear.