I super glued mine back on. Super has to get pretty hot to come apart, I don't think the interior will get hot enough to cause it to fail. Permabond says standard cyanoacrylate glue is good to 82°C or about 179.6°F.

Michael

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Usta haves '69 250/8, '76 280C, 1971 250C 114.023, 1976 450SEL 116.033
Current have, 1983 300SD 126.120