The lower lug is centered between two fins, flush with the end of the main frame tube. It's positioned opposite the engine hook.
The upper lug is glued on the C/G (center of gravity) location.
Some builder's will glue the lug a little forward of the C/G. Who's right? I really don't know. I just center the upper lug length on the C/G and haven't had any problems in the past.
To get the correct center of gravity (balance point) the parachute, nomex and a 24mm E engine were in place.
TIP: When figuring your center of gravity (C/G) for flight, always load the largest engine you will eventually be flying the rocket with.
Here's another "old school" method for lining up two launch lugs down the body tube.
I use a 3/16" launch rod taped beside the launch lugs while gluing.
In the past I have glued 1/8" lugs in place with a much lighter aluminum rod through the lugs.
This 3/16" rod is steel and pretty heavy. It was just easier to lay it beside the lugs to make sure they were straight.
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