Replace it is the easiest and best way. Lots of W123's still out there.

Re-working the sheet metal is an exercise in patience and frustration. It can be done but when you figure out the hours you spent you begin to question your sanity.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now