The part I need to understand about the tensioner and it's locking bolt is how to get a visual on it. Are you guys approaching the tensioner from above or below? I can't see much of anything as there is so much in that area around the power steering reservoir. Where is that 19mm bolt anyways and from what direction are you getting a wrench on it? Thanks.

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1987 300E
1967 Jaguar E-type Series I, 2+2