An anchoring device for anchoring an elongate member to a fixed member having a slot leading to an edge thereof, wherein the elongate member passes through the slot; the anchoring device comprising a sleeve which is fixable coaxially around said elongate member and which is provided with a peripheral groove that has an axial length sufficient to accommodate the thickness of the fixed member at said slot and has an outer dimension being less than the inner dimension of the slot; the anchoring device further comprising a collar member which is carried by, and axially moveable along, said sleeve, said collar member having a leading edge which extends into said groove and engages the edge of the slot when the anchoring device is located within said slot, the collar member being arranged such that the leading edge of the collar is withdrawn from the groove by moving the collar member along the sleeve in an axial direction away from the slot.