as the title says im after a huge favour

from any mechanicaly minded spanner wielding oily finger'd person within 30 miles of me !!
I wouldnt normaly ask but the diamond has started to run really lumpy and i think its the "O" rings round the plugs.
Normaly I would ask MR MAD but I dont want to risk a 100ish mile trip to dartford for him to work his magic

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ANY ONE ?