The short bus.
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There's an aiming forum you should check out. It's just about your speed.
I'd write this in crayon, so that you'd understand, but even then, I think you'd have issues reading it. I can order a Lucasi shaft online. And it fits my Lucasi cue. Dead flush. I don't need to send them the butt. And I can do this with every shaft they make. When you can make 1000 butts that match up with 1000 shafts, in any pairing, you're building a quality product. McDermott can't even do it in 10 cues.
It has nothing to do with a pin they use. It has to do with the tolerances they build to. Case in point - OB makes Uniloc shafts. The inserts are all installed off centre. And their joint diameters fluctuate. So it has nothing to do with the pin they use. Mezz can make uniform shafts across the range of their cues. So can Pechauer.