Good luck with that. Just be VERY watchful of the reaction going on and have a VERY dilute, but slightly acidic vinegar solution nearby to stop the reaction at once if it starts to get out of control. The reaction between aluminum metal (anondized or not) and NaOH typically starts out quite slowly then picks up rapidly as the oxide layer is eaten away. Once the oxide layer is eaten away, however, the aluminum metal will rapidly be corroded by the NaOH and the H2O. So when you start to see some bubbling going on with some intensity, immediately remove the part and dunk it in your very slightly acidic solution. Then dunk it in a large beaker of distilled water and finally just run a great deal of water over the part to ensure that there are no remnant basic or acidic solutions on it.