Estes Black Star Voyager Build, Part 20, Rear Vanes

I don't extend the pencil lines all the way down the tubes, just closer the to top and bottom of the vane ends.

TIP: Mark tubes with pencil, NOT INK. 

I see it all the time on Facebook rocketry groups. New builders using ink to mark the body tubes. That ink can bleed through paint and be visible on the finished model.

TIP: For easier visual alignment, extend the pencil lines over the end of the tube lip.

When gluing on the vanes you'll be covering up the pencil lines. Having the pencil line rolled over the edge of the engine tube makes for easier alignment.

Apply glue to the edges,

Smooth out the glue bead with a fingertip.

TIP: Use a tweezers for easier placement. 

The G alignment piece comes in handy.