I used green Locktite on mine, it's a wicking grade that does not require disassembly. I did slide the gear over a bit, apply the Locktite and slide it back because I was concerned that it wouldn't flow into the gap well. It held for the 3 or 4 years that I had the car after that.

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