Enerjet by Aerotech, Arreauxbee-Hi, Part 9, Engine Mount, Launch Lug & Screw Eye Fitting

With the lower body tube turned over - 

Here's how the engine mount sits, recessed into the body tube.

Note the centering ring is right at and even with top of the fin slot.

With the fin locks in line with the fin slots, test the position by sliding a fin or two in place. You don't have to snap the fin tabs in place yet, just be sure the fins project straight out.

It could be difficult to apply CA glue to the rear fin tab/fin lock joint.

TIP: As shown in the last build, set a toothpick tip into the joint. Drip the CA glue onto the toothpick, enough glue so the drop runs down the toothpick and into the joint.   

The paint was scraped off around the launch lug slot.

Notice the low end of the raised alignment tab stops at the bottom of the lug. 

DON'T SCRAPE the the paint past the bottom end of the slot. The raised lug base sits down to the bottom of the slot.

The picture to the right shows how the CA glue was applied. The glue is applied towards the center so it won't squeeze out beyond the edges of the lug base.

The screw eye is turned into the coupler bulkhead.

TIP: On the right, notice the screw eye isn't screwed in beyond the threads. If turned in past the threads, the screw eye will be loose. The threads help lock it in place. Apply glue on both sides of the screw eye.