Can't make light saber

I just figured out how to make this work. You can only have 1 hilt in your inventory at one time. If you have more than 1, you can temporarily set them down on the floor in the Cantina. The number of crystals your holding in your inventory don't matter but it does seem to matter with the hilt. 

I'm on Xbox Series S 

Idk if it helps but I play on Xbox and there are stacks and when you the right button (rb) it opens a stack 

Hope it helped!

I can't tell you how many other posts, forums, and videos I looked at to try and figure this out, but that was absolutely the problem I was having, and your answer solved it. Thank you!!