in the lower extremity of the needle bar endwise slidable in the second pair of aligned spaced bearing bores 54 55 is a presser bar 65 which in the space between the bearing bores 54 55 is embraced by a presser guide block 66 the guide block 66 includes a lateral projection 67 slidably engaging flat surfaces 68 and 69 on the module frame to prevent the presser bar from turning an upwardly offset finger 71 on the guide block engages one extremity of a coil spring 72 of which the other coil spring extremity engages an offset finger 73 formed on the module frame 50 so as to bias the presser bar in a downward direction a sheet metal presser foot shank 74 to which a presser foot 75 is pivotally connected is formed with an aperture 76 and beneath the aperture there is a struck out portion 77 which is engageable by a protruding finger 78 formed on the presser guide block 66 a fastening screw 79 which passes through an aperture 80 in the presser foot shank 74 and an aperture 81 in the presser guide block 66 and engages a threaded hole 82 into the presser bar 65 which serves to lock together these three parts for endwise movement in unison a presser lifting lever 85 is formed with a cam projection 86 and a pivot aperture 87 which loosely embraces a pivot pin 88 formed on the module frame 50 as shown in fig1 of the drawings a flange 89 on the presser shank 74 is arranged closely adjacent to the presser lifting lever 85 and serves to maintain the aperture 87 in engagement with the pivot pin.