Latch mechanism

A latch mechanism 204 comprises a body 301 having a forward end 304, a rearward end 305 and a longitudinal axis 300, configured to be inserted into an aperture (figure 8, 202) by its forward end 304 in a first direction parallel to the longitudinal axis 300. The body 301 comprises an inner part 302, and an annular outer housing 303 surrounding at least part of the inner part 302 and is rotatable around the inner part 302. A plurality of latch fingers 308-313 are moveably attached to the outer housing 303, each latch finger 308-313 moveable between a closed and an open position, such that in the open position a latch finger prevents removal of the body 301 from the aperture (figure 8, 202) in the direction opposite to the first direction. A guide mechanism (figure 8, 320) is attached to the body 301 and configured to bias the rotation of the outer housing 303, when the body 301 is inserted into an aperture (figure 8, 202), to one of a set of at least one predetermined rotational positions, thereby locating the latch fingers 308-313 in a predetermined position.