Quite possibly discussed before, but new to me and I just realized it.
Background: If you just glue two inside pieces to an inside center, not doing the pin mod, one of the three axes can still get misaligned. For example that YJ 4x4 produced like that.
Now the center piece between/on the two glued pieces will always be there. On my cube, it's a green center piece. So during M-slice edge pairing, I make sure I hold the cube so that green isn't at L or R, which ensures I never get those misalignments during edge pairing. And for parity algs, I hold the cube so that green is at F or B, again preventing misalignments.



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