Curious, how do YOU check valve guides with the "wiggle" test?

One of the miracles of the internal combustion engine is the valve guide, and the fact that it works at all. We don't supply it with direct oil pressure, and we also put a dedicated seal on it to keep even more oil out. Then, we slide it 2 or 3,000 times per minute and at very cold and very hot temperatures and....it lasts many decades and thousands of miles.