provision of hand hole 914 allows the prod to press the mail to establish the space 611 referring to fig1 the closed flip unloader 111 continues to rotate passing horizontal and stopping on a slight incline as depicted in fig1 at this point flip unloader box 121 is inverted as depicted in fig1 the flip unloader box 121 opens exposing the bottom of the tray 131 in fig1 and 14 a vacuum head 1311 rotates into position on top of the tray 131 as depicted in fig1 16 the tray 131 is lifted clear of the mail slug 230 and moved to empty tray discharge chute 1613 the vacuum is disabled releasing mail tray 131 depicted in fig1 as depicted in fig1 the flip unloader box 121 closes over the mail slug 230 not shown in fig1 after flip unloader 111 is closed the tray lid comb 721 not shown in fig1 is indexed securing the mail slug 230 between comb 721 and the flip unloader box 121 and also securing the mail in an edged condition as depicted in fig1 and 20 flip unloader 111 rotates stopping 45 degrees past horizontal interfacing with decline slide 115 flip unloader 111 at this time is generally in an upright alignment corresponding to the initial alignment but at a different angle from the horizontal from that of the initial.