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If you need to get another flywheel Chester Hudson in East Sussex has some, but the AC engine was fitted with two different types of flywheel, when I spoke to him 2 or 3 years ago he had both types and several of them, as I needed one myself. If ever you need a head gasket for the AC engine I have 2 new ones here. If you have not got the flywheel off the best way that i have used many times is to get a small piece of 10mm plate say 3or 4 inches square, Drill 1/2″ hole in the centre and weld a nut over the hole then drill 2, 5/16″ holes either side of it to match the threaded holes in the centre of the flywheel, If I remember correctly the flywheel is threaded 1/4″ unc so you can then attach the plate to the flywheel with 2, 1/4″ unc bolts but be careful to not screw them in to far for fear of damaging the coil, then screw a bolt in the centre nut that you welded on and tighten firmly, give the flywheel centre a soaking in WD40 or similar, then wait a few minutes then give the bolt head a sharp tap this should release the flywheel from the taper and key, but before doing this do not forget to slacken off the flywheel retaining nut a coupe of turns, if the flywheel is not released at the first try tighten the nut a little more and you should get the flywheel released.Regards Chris.