Tweening parts position towards position of another part welded to the character model

Ive been trying to script this light saber, but I keep running into an issue where it seems the part whos position im trying to tween has some strange behaviour. What I believe is happening is that when referencing the position of an object, you get that objects world position, so the part im trying to tween would tween to an old position and not to where the goal part currently is (whilst the character is moving). If anyone knows a way around this let me know.

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