Hi all. I'm new around here and am preparing to build my first saber. I've been reading the tutorials and deciding on the different components I want to use. I haven't really seen this explicitly addressed anywhere so I was wondering... how are the battery pack and driver/sound board (if I choose to use one) secured inside the hilt?

If I am swinging my saber around I don't want the batteries sliding up and down damaging things.

Thanks in advance for the help and I'm sure this is just the first of many noob questions to come