Ok, not quite, but I managed it today with very little in the way of accurate machining tools. Credit must go to Mark (aka Bald T**t) who some of you will know from Shires, for suggesting this method.
Obviously the pressure plate needs to sit dead centre on the flywheel. Problem is...how do you know when it is?
Firstly, I measured the width of the pressure plate (288mm). Then the width of the flywheel (327mm). The difference in diameters is therefore (327-288) 39mm. The difference in radius is then (39/2) 19.5mm. So the pressure plate needs to sit 19.5mm in from the edge of the flywheel.
Armed with this knowledge, I made a bracket which bolted into a bellhousing bolt hole. On the end of the bracket is a bolt (sharpened to a point on a grinder). By adjusting the postion of the bracket, the bolt needs to sit 19.5mm in from the edge of the flywheel.
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By spinning the engine on the starter, you end up with a nice circular line - this should be dead central to the middle of the flywheel. I actually made two lines - one for the outside edge of the pressure plate, and another for the centre of the bolt holes.
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The rest is easy! Pop the flywheel off, plop on the pressure plate, mark and centre punch where the holes should go.
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Then it is just a case of drilling (using my Aldi special mini press drill) and tapping the holes (5/16 UNF).
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And voila! One flywheel with series clutch. As far as I can tell with my measuring devices, it is dead central.
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