Estes Mini Scale Combo Pak, #0874, Tomahawk & Exocet, Build, Part 11, The Exocet Launch Lugs

Here's the instruction launch lug illustration:

The forward lug should be set back 3/8" to hide it behind the leading edge of the upper fin. 

The lower lug is set into the root edge of a lower (offset) fin.

If the lower lug is set into the root edge,

(The upper picture is a dry fit)

Enlarge the picture - 

Note the lugs aren't in line if glued on this way. This could cause friction on the launch rod.

The lugs are larger than the instruction illustrations suggest.

The lower lug was glued on a little to the right of the lower fin root edge.

Now the two lugs are in line.