Textile machinery comprising a card having a main swift and a member which is a working cylinder or a comb, juxtaposed to the main swift and having a shaft. The distance between the main swift and the shaft is adjustable by providing a support for the shaft, the support being mounted on and for movement relative to a frame of the card. A gauge holder against which the support is adapted to bear, has a plurality of rotated positions in each of which the gauge holder imparts to the support a different position, in each of which different positions the shaft is at a different distance from the main swift. A fluid pressure jack applies the support to the gauge holder. The gauge holder is rotated by a ratchet and pawl assembly actuated by another fluid pressure jack. The gauge holder has a plurality of gauges thereon radiating in different directions therefrom, those gauges being of different lengths and being selectively engageable with the support.