The tunnel is glued in line with the fin, opposite the engine hook position.
In the old Estes Wac Corporal kit, the open ended tunnel covered the long launch lug. It had to be glued between the fins.
Two short lugs are used in the Semroc kit.
Both are glued in line, directly over the engine hook.
The lower lug is glued right above the tail cone/body tube joint.
The upper lug is glued 4" above the end of the body tube.
I could have used Titebond Quick and Thick to do the lug fillets. Instead, I went old school - it took four glue fillet passes to get rid of the glue bubbles.
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