How can I make a part stay glued to one whose size and CFrame is changing?

I’m making a modelled powerbar and I have an issue when it’s about keeping a part sticked to another. From the start I tried constraints (weld, etc) to keep the wedge glued to my being-resized part.

I don’t know very well how welds work, and this is the result I get after welding a wedge to my sizeable part and resizing it after.

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Is there anyway I can do this?

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Have you tried adding a spring and making the damping property higher?

The part would disappear with the spring only, using it with a weld wouldn’t work (stays there), nor anchoring it.