Do you have a pic of the damper handle? Being thin aluminum, you could possibly reshape. As long as it wasn't reshaped before, it should lift back up w/o cracking at the bend. Lift back into position w/ flat screwdriver (or small prybar). Then use a piece of wood (or small piece flat steel) on each side of it & clamp tightly. Should look normal afterward.
If that won't work & you have to replace, drill the end off the rivet from inside the lid. Will pop right off with no porcelain damage.
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