What should I do if the thumb throttle does not return to its normal position?

If the thumb throttle is not returning to its normal position, check if there is enough space between the throttle and the handle grip. If there is not, you should adjust the position of the thumb throttle or the handle grip so that there is a proper gap between them.

Also, check if the thumb throttle set screws are loose enough. If they are too tight, the thumb throttle can easily get stuck. 

If these steps still do not resolve the problem, please contact our after-sales service team for repairs.