The Alien frame requires a pdb as a brace, but if you don't need that PDB it's about 11g of dead weight. This cuts down the weight a bit and is still allows arm removal without 3d printing a nut holder or dismantling the quad.
This design is UNTESTED.
Requires 4x pressnuts (apparently you should buy a few extra press nuts because sometime the aren't threaded perfectly):
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