The engine block and centering ring placement on the Estes Tazz instructions can be confusing.
In the instructions the engine block (Part B) isn't butted up against the upper bend of the engine hook. If glued as shown (even with the tube end) there will be a 1/4" gap between the hook bend and the block. You want the engine block touching the top bend of the hook otherwise the hook could get loose after a few flights tearing into the tube.
If the rings were glued over the pencil marks there wouldn't be enough space between them for the supplied 1 1/4" wide streamer. Sure, you could cut down the width, but I'd rather have as much descent drag as I can get.
Dry fit the parts before using any glue on the rings. Use the streamer width to set the space between the rings. The upper ring will end up higher, closer to the top bend of the engine hook.
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