Okla. Stat. tit. 20, § 1103C

A Justice or judge whose employment as such has terminated and who has withdrawn his contributions made to the Oklahoma Judicial Retirement Fund may, upon return to service as a Justice or judge with participation in the System, procure reinstatement of service credit for the years during which contributions were made and withdrawn by paying the Oklahoma Judicial Retirement Fund the full amount of contributions previously withdrawn with interest thereon at the annual percentage rate of ten percent (10%) from the date of withdrawal.