34 over which they must pass into their respective spline openings 33 the size of this gap is determined by the thickness of the base 20 which limits movement of the panels 11d and 11f towards each other fig8 through 19 illustrate on an enlarged scale a number of different connector members all of which include the basic features of the present invention as described above there are two basic connector members a first type as shown in fig2 and 8 through 10 wherein the flag is formed as a bent up portion of the base and a second type as shown in fig1 through 19 wherein the flag is a separate piece of material from the base and is welded thereto along one of its edges and preferably welded to its respective locking pin along a second of its edges fig8 and 9 show a connector member 15b which is similar to the connector member 15 of fig2 except that it is bent at a ninety degree angle so as to join together the panels 11h and 11g at such an angle if the panel 11g were slightly curved upwardly in fig8 this connection might be used for example in area d of fig1 where a lower generally flat panel 11 joins with a lower panel.