The engine mount was glued in first. As I mentioned before, there is not much clearance between the ST-8 and ST-7 motor mount tube.
TIP: By gluing the engine mount in before gluing on the fins, I can then mark the tube and center the engine hook between two fins.
Here's the small upper fins on the ST-7 tube.
Look close to see the filler primer filling the remainder of the lower tube seam. In the higher seam you can see some beige CWF filler.
I didn't think the engine mount upper ring glue joint was strong. With the tubes so close together, I dropped in some glue to fill a bit of the void at the rear. After it dried the glue shrunk and wasn't as visible.
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