There are two square posts on the dorsal that fit into two recesses in the dorsal section attached to the saucer, then the one screw.
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Is the top of the dorsal plastic piece? if not then simply drilling and taping additional screws may be enough. One between the two white "bumps" ( turboshafts?) - One might b able to add a slotted screw at the forward angle as well. that you tpretighten to fit into a slot you make in the saucer at that same angle..
If that top secion is plastic, I think I would try carefully drilling into that forward angle at the top of the dorsal , trying to avoid the window next to that "1" - and then epoxying (or loctitie and baking soda) a metal rod in the hole on the main hull side. Since they have left us the ability to disassemble the model.. one may be able to fashion a second support for the rod inside the dorsal near where it connects to the main hull- or perhaps even further... Perhaps even add a whole pipe in there with a metal rod that goes inside the pipe. Slide that rod into a similar hole/pipe on the saucer side drilled into the angle and you will have a much firmer linkage and support that extends at a 45 degree angle toward the center of the saucer, which should do a lot to support it . You may have to shave the rectangular bumps to the same angle to allow connection - depending on how much "play" there is in the rod system.
Using such a pipe/rod arrangement would allow you to remove the rod when separated for display--you might need to 3d print some sort of plug for the holes on either side, thus preserving the "feature" -Again , why Tomy didn't look at this for more than 5 seconds and make a small design change like adding a diecast channel in the dorsal for such a rod, is beyond me. "Oh Yeah, hey guys, I know we promised connection with one screw, but turns out the saucer was too heavy, so there is a rod you insert and slide down at a 45 degree angle, which can be removed, and the holes plugged with this little plastic bits. We had to modify the bumps slightly ( they are supposed to be on the plans as actual model detail) but this eliminates a clumsy and ugly stand, so we hope the modification to the bumps is acceptable to most.." Since most didn't ever intend to display the saucer separately , very few would have cared.
OF course those rectangular inserts provide surface area to glue to depending on how well that bit at the top of Dorsal is attached for those seeking a permanent solution. But if that section is plastic.. I am less optimistic about that holding over time.
I can't wait to see the brave soul who is going to disassemble the model and show us the guts
