the two legs 22 and 28 toward the positions shown in fig6 upon the removal or lessening of any force acting against those legs causing them to deviate from the 34 open 34 position shown as seen in fig5 and 7 the legs are deviated from the positions shown in fig6 by means of the strip 34 moving past a stationary tool 36 which lifts leg 22 and depresses leg 28 causing leg 28 to be folded under leg 22 in a 34 closed 34 position after the second 28 has been folded under the first leg 22 the strip proceeds toward a pair of rollers 38 40 and as is seen in fig8 the first leg 22 overlaps the second leg 28 to a greater degree the rollers are provided to adjust and set the crease of bight 30 to provide a more flattened retainer as is shown in fig9 after the strip has passed the rollers the individual retainers can be cut off in any desired length in the configuration of the retainer as shown in fig9 the initial bias of the legs causes the first leg 22 to be biased against the second leg 28 and also the second leg 28 is biased against the first leg 22 thus the legs are acting against each other along two grip areas one coinciding with the enlarge rounded end of the first leg 22 where it overlies and presses against the second leg 28 at 42 and a second area at an end 44 of the second leg where it presses up against the first leg 22 at 46 thus referring back to fig2 the sheets s1 and s2 are secured by the retainer.