61 which by way of example only are illustrated herein as being generally cylindrical but may be of a variety of configurations disposed within each bore 61 is a latching element 63 and in the subject embodiment the latching members 63 are identical and thus may be interchangeable preferably the latching elements 63 are hollow to receive therein a single compression spring 65 with the bores 61 arranged diametrically a single spring 65 is sufficient to bias both latching elements 63 radially outward toward a latched condition as shown in fig3 referring now to fig2 and 3 together the outer body member 17 defines by way of example only a pair of ports 67 at least one of which is in communication with the engine oil passage 23 see fig1 the ports 67 open into an annular internal groove 69 the groove 69 forming an annular latch surface 71 see fig4 each of the latching elements 63 includes a latch portion 73 each of which is generally half circular see fig5 and each of which includes on its underside a generally flat planar stop surface 75 each latch portion 73 includes a radially outer end surface 77 which in the subject embodiment has about the same radius of curvature as the adjacent annular internal groove 69 each latching element 63 defines a flat 79 which is preferably perpendicular to the planar stop surface 75 adjacent each flat 79 the inner body member 19 defines a vertical bore 80 and into each bore 80 after the latching elements 63 are in place in the bores 61 a pin 81 is pressed in and is disposed closely spaced apart from the flat 79 as shown.