A locking mechanism comprising: a socket and a body member slidably received in an opening in the socket; the socket or body member having an engageable member for exerting a bias against the other member when the body member is slidably received in the socket, the other member having a first set of channels comprising a first longitudinally disposed channel for receiving the engageable member when the body member is received in the socket, a second longitudinally disposed channel disposed parallel to the first channel spaced from the first channel, and a transverse channel connecting the first and second channels (D, G), said first channel terminating in a locking area having a depth greater than a depth of said first channel immediately adjacent the locking area and said locking area being contiguous with said transverse channel, wherein said body member is slidably received in said socket with said engageable member received in said first channel and slidable with a first movement in said first channel to insert the body member in the socket, wherein said engageable member will be prevented from further slidable movement in said first channel when said engageable member is received in said locking area, said engageable member being biased into said locking area and being prevented from disengaging from said locking area and thereby locking said body member into said socket, wherein said first channel has a first ramp surface that ramps to said locking area to exert an increasing bias against said engageable member as said body member is inserted into said socket, and wherein the second channel has a second ramp surface that exerts an increasing bias against the engageable member as the body member is slidably extracted from the socket, further wherein said body member is removable from said socket when said engageable member is in said locking area by rotating said body member in said socket to move said engageable member into said transverse channel until said engageable member aligns with said second channel, thereby allowing said body member to be extracted from said socket by a reverse-slidable movement opposite said first movement with said engageable member moving through and out of said second channel, characterized in that said transverse channel has a transverse ramp surface that exerts an increasing bias against said engageable member into said second channel. a socket and a body member slidably received in an opening in the socket; the socket or body member having an engageable member for exerting a bias against the other member when the body member is slidably received in the socket, the other member having a first set of channels comprising a first longitudinally disposed channel for receiving the engageable member when the body member is received in the socket, a second longitudinally disposed channel disposed parallel to the first channel spaced from the first channel, and a transverse channel connecting the first and second channels (D, G), said first channel terminating in a locking area having a depth greater than a depth of said first channel immediately adjacent the locking area and said locking area being contiguous with said transverse channel, wherein said body member is slidably received in said socket with said engageable member received in said first channel and slidable with a first movement in said first channel to insert the body member in the socket, wherein said engageable member will be prevented from further slidable movement in said first channel when said engageable member is received in said locking area, said engageable member being biased into said locking area and being prevented from disengaging from said locking area and thereby locking said body member into said socket, wherein said first channel has a first ramp surface that ramps to said locking area to exert an increasing bias against said engageable member as said body member is inserted into said socket, and wherein the second channel has a second ramp surface that exerts an increasing bias against the engageable member as the body member is slidably extracted from the socket, further wherein said body member is removable from said socket when said engageable member is in said locking area by rotating said body member in said socket to move said engageable member into said transverse channel until said engageable member aligns with said second channel, thereby allowing said body member to be extracted from said socket by a reverse-slidable movement opposite said first movement with said engageable member moving through and out of said second channel,