Jack rear of car up using my 3 ton trolley jack on the tow ring at centre of back underneath. Inserted axel stands under rear jacking points on the sills. Let jack down slowly so the stands take the weight. Lock the jack off just in case the axel stands dont like it. Placed my 2 ton trolley jack just to one side of the diff say 3 cm off centre to the left said as looking at it, Put a piece of 25mm thick wood across the jack lift pad so it allows the diff frame to take the strains and not the cast itself on its own. Jack the whole diff assemble about 8-10mm only.
That allows the 29mm socket to engage with the bolt head which is really easy to undo like it wants to come out, That is due to the plastic washer. The above mentioned Cortico part ( a peugeot gear box drain plug) 22mm thread with internal ( female ) hex socket in middle 12mm. The new plug is quite loose sitting on my finder tip with a finger down the side but it engaged easily and the fingers twisting were enough to get the thread to engage then the 12 mm allen key sorted the rest. I used the supplied copper washer and then tightened down to firm not wrist breaking tight as your going into a casting. Gently let the 2 ton jack down and removed it from the scene and then used the 3 ton to lift and remove axel stands. Sorted. Time almost ten minutes.
hope this helps and others dont remember a much easier way or I'll...??.
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