So, does a crystal retain the upgrades that someone puts into it, once it's removed from the hilt, and or given to someone else?
I don't recall the rules specifying this, and the "attunement" always felt like a personal, mystical bond thing, more than a mechanical thing. So that while Padawan McStabby has fully tweaked his crystal, 200 years later, Padawan Stabs McGee finds his ancient saber in a ruin, does it have all the nifty tweaks? Or for Stabs McGee, would they need to again, re-attune the crystal to themselves, otherwise working with a basic crystal stats?
I ask because I've got a young Force user in my game, who has inherited a saber from a dead mentor, and I realized I hadn't stat'd out the crystal, feeling free to let the player do that himself.