Slowly advance the bulkhead over the motor mount tube and launch lug.
Try to keep it level as you get nearer to the cone sides.
If you press it in crooked, you might not be able to pull it back and re-position it.
When you get into the cone walls, you'll understand why I sanded a slight angle to the bulkhead sides. That angled side lets you get the bulkhead in without pressing a bulge in the smooth cone sides.
Press and check the outside, press and check again.
The few times I've seen a Vulcan (a X-24 Bug or HL-20) at a launch, there is always a bulkhead ridge seen from the outside.
Some of the ridge is caused by too much glue being used for an internal fillet.
Apply the fillet using a Q-tip and remove the excess immediately with another Q-tip.
Too much glue will shrink the cone wall and surface dips can show on the outside.
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