1. Check whether there is lubricating oil or other substances on the wheel disc, which may reduce friction and make the wheel disc turn faster. If there is, you can gently remove it.

2. The weight of the manual wheel can be adjusted to make it rotate more smoothly. The specific method is to put some heavy objects on the edge of the wheel, but make sure that it does not affect the normal rotation of the wheel.

3. If conditions permit, electric devices can be used instead of manual roulette, which can make the speed of roulette more stable and controllable.