18 which is accomplished by entrapping the attachment tube 40 inside the header flap 42 by encircling the tube 40 and engaging itself prior to fastening the tube 40 to the beacon the attachment tube 40 may be coupled to the beacon 18 in a spaced apart generally parallel relation thereto as shown to enable the flag 34 to project perpendicularly from the longitudinal axis 44 when mounted to the beacon 18 fig5 shows the components of fig4 in cross section wherein it is seen that the main body 35 of the beacon support 18 may be generally tubular and hollow an intermediate stage of assembly wherein the flag retainers 36 38 engage the lugs 30 32 is shown in fig6 fig7 shows the fold up light and flag beacon 10 of fig2 but rotated about its longitudinal axis 44 by ninety degrees fig8 shows the subject matter of fig2 in cross section and also calls out details a b shown in fig9 and 10 fig9 shows how the beacon support 18 engages the upper mast tube 16 the lower end of the beacon support 18 terminates in a socket 46 into which the upper mast tube 16 may be inserted the elastic cord 20 passes through the hollow center of the upper mast tube 16 passes through a constriction 48 formed in the socket 46 and terminates in a knot 50 thereby being entrapped by interference fit at the lower end of the beacon support 18 the elastic cord 20 extends downwardly from the upper mast tube 16 through the lower mast tube 14 and into the base 12 as seen in fig1 the elastic cord 20 emerges.