There is an undeniable soul to old-school engine building. You know the exact feel of a perfectly dialed-in micrometer, and your shop was built on decades of hard-earned craftsmanship. But let’s talk facts: when a customer brings in a high-dollar rotating assembly destined to live at 10,000+ RPMs, relying on the drifting calibration of a 40-year-old analog balancer is a …