It's a cheap enough part on a nice enough rocket I'd just order another; or at least do something to strengthen it, else the first heavy landing might go poorly.
iirc, the Estes 4" tubing used in the MDRM is the same as Loc 3.9 airframe. If I am wrong on this someone please correct me.
Be willing to bet Estes makes it right and ships you new tubes .
Just my experience. Fix the other stuff and use it elsewhere for one of those, always wanted to try that projects - if it goes wrong, no harm done.
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