plastic components and having a needle drive handle 10 at the back end and a forward portion generally indicated at 12 and extending axially forwardly of the needle drive handle 10 the forward portion 12 is substantially hollow and channel shaped and defines an axially extending looper holder slot 14 and an elongated axially extending needle holder slot 16 the slot 14 receives slidably a looper holer 18 having a looper 20 secured thereto the slot 16 receives slidably a needle holder 22 having a needle 24 secured thereto a looper drive handle 26 is secured to the back portion of the looper holder to reciprocate the looper holder axially within the looper holder slot of the housing the needle holder is secured at a fixed position with respect to the housing by a needle lock 28 the needle drive handle 10 is hollow to define a needle case 30 whose open back end is closed by a lid 32 yarn or fabric strips are fed from the rear of the device through a top yarn guide 34 through one of two lower yarn guides 36a and 36b one on each side of the housing and through a needle yarn hole 38 referring to fig2 and 4 the looper holder 18 is an integrally molded plastic component having an axially extending row of transverse holes 38a through 38d through a downwardly extending projection from its back end and an axially extending row of transverse holes 40a 40f through its forward end the looper drive handle 26 can be secured to the looper holder 18 at a selected axial position with respect thereto by means of a looper adjustment screw 42 passing.