into the sliding cord 2 a the end of the cord 2 is compressed further by the lengthwise taper of the sliding cord cavity 15 which therefore interferes with the sliding cord 2 a increasing the tension of the slide as also indicated in the cross hatched portion of fig1 a the end stop 11 positions the cord 2 for assembly of the catch mechanism and encloses and encapsulates an end of the anchored cord 2 fig3 a shows the longitudinal taper in the cord enclosures fig4 shows the end elevated view of the top portion 3 of the catch mechanism the raised section 12 is inserted into the lower section 4 filling the cord cavity upon assembly the top portion of the sliding cavity 10 a is shown as well as the radiused ends of the keyway pins 9 a and 9 b the position of the upper compression ledge 8 b is shown in relation to the sliding cavity 10 a the relationship of the size and the location of the anchor hold down pin 6 to the front prong 5 a which centers the anchored cord 2 as it leaves the mechanism are shown in this view the end view of the top and bottom portions of the catch mechanism prior to assembly is shown in fig5 the anchored cord 2 and the sliding cord 2 a are shown in place for assembly into the extended cord cavity 17 the relative location of the anchor pin is shown prior to piercing the anchored cord 2 the cords will be compressed into the vertical tapered cord cavity 17 and the longitudinal taper 15 as shown in fig1 a the compression ledges 8 a and 8 b also act to compact.