Don't use the powersteering nut. That is a tapered shaft and over torquing it can make that pulley a bear to get off some day. Use a 27mm? socket on the crankshaft bolt, you don't need to remove anything to get at it. Or get a length of wire and jump the starter over to turn the engine. (+ battery terminal to the small screw of the junction box near the battery)

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Adam Lumsden
(83) 300D
Vice-President of the MBCA International Stars Section