I'm not sure what the bolt is that you have circled in your top picture, but I don't think it's the rail bolt. In your second picture, I can see one of the pins at the 11 o'clock position above that bolt. It is recessed into the block and requires a special tool to extract. As I recall, there are four or five of those pins that hold the various rails in place.
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Don
'85 500SL (Euro) - 186,000 w/a complete restoration and engine rebuild at 154,000
'95 C280 - 174,000
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