Please excuse the numpty question (and slight O ring thread hijack), but what does one use to lubricate the 'O' ring - silicone grease?? On a vaguely related matter, reading the build manual in preparation for my build, in the section regarding fitment of the gearbox to the engine (Duratec 6sp), the manual advises you to smear silicone sealant over the O ring that goes around the selector shaft - is this correct, as silicone grease and silicone sealant are quite different products, aren't they? Thanks (and apologies again) Chris