Mobility scooter throttle levers are designed for simple finger operation; adjustable tension and ergonomic grips decrease h.

https://www.scribd.com/document/1048373887/The-Main-Problem-With-Best-Mobility-Scooter-UK-And-How-You-Can-Resolve-It-132390

Mobility scooter throttle levers are created for easy finger operation; adjustable stress and ergonomic grips reduce hand fatigue.