Which constraint would be best?

I’m making a bow and arrow and i made it so the string part of the bow tweens back like someone is pulling it, but there is one problem. One part of the string is moving. Let me show you a video to show you what i’m talking about.

Video

Basically, I just wanted to know if there is some sort of constraint or weld that will keep that part of the string in the same place while it’s tweening and if there is one then which one is it?

You could have 3 attachments on your bow:
one on the top,
one on the bottom,
and one in the middle that you would tween back and forth.

You could then use 2 beams to connect the top to the middle and bottom to the middle to create the string.

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