The rear root edge fin cut is set 1/4" up from the rear end of the body tube.
To make it easier to line up, a pencil line was drawn at the end of the root edge.
Fins and the launch lug were glued on.
Notice the fins aren't even with the end of the body tube.
On a small model like this I used wood glue for the fillets.
The launch lug fillet left bubbles as it dried so Titebond M&TG was used on the lug fillet.
The glue at the end of the lug fillets can be "rolled off" using a pointed to Q-tip. Roll the tip between your fingers and you can remove the glue at the tight end. Use this pointed tip just on the ends of the lug.
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