We did stick a $15 key switch from Shucks in my brothers Renault R15 and I've a friend that did it to a Healey (sp?) 3000. It has a starter button and the key has the spring return start position. Cheap anti-theft since he hook the horn to the key start position. If you don't know any better, you just keep honking the horn.

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