You would know what i am talking if you are an actual roulette player, the following are applicable for both live and machines. What are the counter measure that you have seen a casino has deployed?
- Changing the location of a wheel frequently
- Roatating the wheel frequently
- Cleaning and polish a wheel once a week
- Removing a machine
- Dealer start to spin the rotor speed/ball differently when someone start to win.
- Reducing the occurence of numbers on a number board.
- Changing the roulette wheel location to a low ceiling.
- changing ball
- calling no more bets early.
- closing the machine temporarily when the month/week chi square shoots up due to stable conditions.
- changing dealer frequently
- dealer changing rotor speed/ball strength every spin.
They never really level a wheel becasue a wheel is already level. 99% of the time they use a spirit level to measure the wheel and just said the wheel is level after measuring it with the spirit level in like 5 seconds.
I am not going to disclose which countermeasure is effective or not but i can say most countermeasures are ineffective and a true pro player can think of those countermeasure helps them to win even more under some conditions.