• What was the reliability issue? And what exactly is inappropriate about the way they are made?

    I think specifically the X2 suffers from more cracked face plates than is acceptable, which is not a surprise when you look at the design.
    Milling from billet is inherently inferior to the near-net-shape forging which the shape of stems allows for, and which is used by most serious makers.

  • Interesting, I've always stuck to the x4 stems, tightening in an X to spread the load evenly, never had issues. I assume X4 are made more durable

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