BT-50 tubing is too thin for me. many rockets end up with a crimp right above the interior of the engine mount. This tube will get a coupler for strength.
A 2" long piece of BT-50 is slit down it's length. Slide this into the main body tube and mark the overlap. Remove the coupler.
Cut off the overlapa little inside the pencil line. Slide it back into the main tube and trim more if needed.
The interior overlap piece is cut oversize from 110 lb. cardstock. Glue in place with a glue stick. After it dries trim off the excess.
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