Andy Yes reckon the roll pin come the bodge it it up brigade as never seen a flywheel nut come loose had alloy break a few times where the rope hooks onto so fitted a new one and found the alloy is just a tight push fit so skimmed a bit off the steel and welded a nut and pressed the alloy back on this makes it so much easier to fit and all that I have seen had head gaskets made from soft 0.055 thou sheet alloy, the only major failure had was a die-cast flywheel with internal metal corrosion causing expansion and came loose from the steel boss causing a slight knock at idle.
