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I tried looking up star saber upgrade kits to see whats out there but it seems like the only stuff you can get are an articulated Brain of Courage by Perfect effect, which seems like a bad idea considering the way it's compressed when you put it in Saber's chest, and some ratchet replacements by KFC which I didn't even bother researching further.
I need to stop looking for upgrade kits with a particular idea in mind, I always ended up disappointed. Literally the only thing I wanted are a replacement sword handle and shield handle so he can hold them the "proper" way more easily.