Estes Black Star Voyager Build, Part 15, The Upper Fins, Steps B

The T pieces are glued onto the leading edge.

Run your fingertips down the leading edge to make sure there is an even overhang on both sides.

Sand the sides so the T pieces are flat and even with the R piece sides. 

The instructions say to "trim the ends even".

Trim a little long, then use a sanding block to match the angle ends of the R pieces.

The single 3/16" diameter launch lug is cut in half.

Use a new single edge razor blade, Cut straight down.

Use a sharpened dowel to re-round the ends.

I set the two lug pieces on some Q-tips for a handle for brushing on a coat of CWF