Hello everyone, I have A LOT of raw crystals that I have collected using my Archeology crew skill. How can I transform them in order to make them useable as a color crystal or otherwise in a lightsaber? Thank you in advance for your knowledge!

I just got this nice lightsaber. I clicked on Control + right click and tried to put a new crystal in and it would not stay in place. Can I modify this lightsaber? Or, is it “as is”? I modified my first lightsaber, but this one seems different. Also, how do I increase my Legacy level to add augmentations?