Roulette wheels bias

Rumor has it, especially with older wheels, that the rotors deteriorate, pockets become worn, and frets get loosened. When this happens, the formerly random roulette wheel will become “biased” and start to favor certain sections or even certain numbers. Instead of coming up once every 38 spins, a spongy slot or the worn frets around it will cause a number to win once every 30 spins or so. At least in theory.
Hallelujah! You’ve found El Dorado! Now all you have to do is get out your pad and paper and record, oh, about 3,000 or so spins of a particular wheel (that’s the minimum it’d take to find a bias). At roughly one spin for every two minutes, it should take you only about 100 hours of continuous observation before you’d want to draw any conclusions. Of course, God forbid after 100 hours you realize that this particular wheel doesn’t have an exploitable bias, so you have to find another wheel and start all over again.
And if you did manage to find a biased wheel, hope that the ever-vigilant casino personnel didn’t replace it, rotate it, or even schedule its usual weekly maintenance, any of which would throw all of your observations out the window. Was roulette bias ever a profitable strategy? Absolutely. But with today’s precision-machined wheels and constant maintenance standards, finding a biased wheel is about as easy as finding a Mensa membership card at a Larry the Cable Guy show.