Include a clause that states that your manager needs to check your availability before booking modeling jobs. Add a clause that states you are not an employee of the manager but a client paying the manager to do a service for you. State the percentage you will pay from each of your bookings to your manager.
A jammed finger can lead to some complications, including: long-term pain and swelling in the joint, known as traumatic arthritis; stiffness in the finger; weakness in the finger; permanent inability to straighten the finger; deformity of the joint
That is how you jam your finger. The force that hits the end of the finger is translated through the bones into the joint. Often, the ends of the phalanges (finger bones) are bruised at the knuckle, and this is what causes the swelling, as well as damage to the capsule. There are other ways to suffer a finger sprain.