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I rebuilt my now 30 year old gas grill a few years ago. Ground off the bolts holding it together, put the cast alunimum parts in my gas self cleaning oven, they came out looking brand new.
Replaced wood shelves with steel, repainted and reassembled. Had some rusty steel areas welded.
New burner, new regulator and hose. Finding a replacement burner required a stop at a speciality grill store.
It was a BIG job, but well worth it since it was my moms grill. We had lots of nice meals on that before she died.
It would of been far easier and cheaper to buy a new grill, but this project wet far beyond $$$
setiment has value too:)