What is the deduction for performing a one-armed vault?

The deduction for performing a one-armed vault is indeed 1.00. In gymnastics, vaults are expected to be executed with both hands upon the apparatus for proper form and safety. Utilizing only one arm not only compromises the integrity and stability of the vault but also deviates from the expected standards of performance. As such, a deduction of 1.00 is applied to reflect the significant technical error introduced by this deviation from the typical execution. This value is within the established criteria for deductions on execution faults, ensuring athletes are evaluated fairly and according to the skill set expected at their level.