wheels are very well engineered and casinos run programmes to check for bias,
however if i was going to make one particular slot for the ball to fit ever so slightly more easy in than others it would be zero,
for all the possible evens bets the house advantage is only gained by the probable 1/37 times that the ball should hit zero,
in the uk in casinos half of all evens bets red/black, odd/even, 1-18/19/36 are returned giving the house a mathematical advantage of just1.35%,
they make the rest of their profit from mug punters,
mean18.co.uk