What's the COF? What's the cost of downtime? What's the ROI? I don't need FFT & modal analysis techniques to replace the bearing on a wheel barrow. I'll just replace it when it squeaks. Again, the author emphasized the asset can operate for years out of balance or misaligned. So, my level of concern is minimal. There needs to be a reason or return to invest more money. By the way, I reviewed a bunch old WWII oil flooded recip's once in China and the old earth quake (ball & pivot) mercury switches provided sufficient protection >99% reliability for 50+ years. No financial return to invest in anything else.