The die-cut centering rings required some sanding for a friction fit.
On the right is a dry fit of the engine mount, the rear ring will end up 5/8" inside the tube. Shorter, stubby models sometimes need this recess for stability.
The engine mount was set beside the tube to mark the centering ring locations.
A gluing dowel was marked to apply glue for the forward ring.
The rear ring will get a fillet applied afterwards from the rear.
I see this more often than I should - the fin marking guide ends don't match up!
Wrap, fold and mark - make your own.
TIP: On models where the launch lug is between two fins, line up the launch lug with the engine hook.
On the launcher this puts the rod and launch lug behind the model for a pre-launch picture.
When installing the engine, place the igniter wires forward or to the side away from the engine hook. With the launch rod and engine hook at the back of the model it's easier to attach the micro clips.
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