distance between the deformed and undeformed portions may vary these distances may be even or uneven similarly this principle may be incorporated into a double zipper the principle of the method of deformation of inwardly deformed portions 38 is illustrated in fig1 13 in fig1 an undeformed section of female zipper profile 12 is presented to crushers 100 102 or alternately as described herein rotating gears this undeformed section of female zipper profile 12 may be at room temperature alternately it still may be relatively soft from retention of the heat of the extrusion process which formed it or it can be reheated to aid in the deformation or crushing process first and second crushers 100 102 impinge against respective first and second upwardly extending female detent arms 18 20 thereby upwardly crushing first and second upwardly extending female detent arms 18 20 to achieve the upwardly crushed configurations of deformed portions 38 38 u2032 of fig1 13 the deformations illustrated in fig1 are above the base 16 and likewise below the apices of the first and second upwardly extending female detent arms 18 20 additionally the deformation illustrated in fig1 includes a pinch structure 39 at the middle of the upwardly extending female detent arms 18 20.