How do you get a lightsaber on Star Wars knights of the old republic 2

After finishing Telos, do not go to Nar Shaada, go to Onderron. You will crash land on Dxun and try to go to the Mandalorian camp. Talk to bao-dur on the Ebon Hawk and find out what you need. While helping the Mandalorians you will find the required parts: lens, focusing crystal, power cell, and emitter matrix. Before Mandalore takes you to Onderron you must go back to the Ebon Hawk and talk to Bao-Dur. He will help you build your Lightsaber. If You don't go back and go to Onderron, you will have to wait until after you get Dhagon Ghent out of jail.