The short answer is yes. Many air driven handpieces have easy access to turbines. New turbines can be purchased with the necessary o-rings, washers, etc... Cleanliness is key here. Handpiece head and back cap can be cleaned with alcohol and a cotton swab. O-rings can be replaced with an explorer pick. However, electric handpieces and contra angles should be sent for repair due to the complex nature of assembly. Highspeed electric contra angles contain multiple gear sets (similar to an automobile transmission) to achieve the speed necessary for hard enamel removal.