Knights Reborn

In a previous post similar to this, I wanted to know how to replace a default saber with a modded one. I was told to rename the PK3 to a letter that started with one of the default sabers. However whenever I'd do that, ( I.e Rename Movie Sabers PK3 as '' AaaaSaber '' to replace Arbiter ) It wouldn't work.

Appreciate it if I could get some ideas on how to do it.

If you use JA++ you can just do cg_forceOwnSaber "saber-name"
Else, you have to edit the .sab file