Vintage Horticultural and Garden Machinery Club

Grahame , you do seem to have made a most simple task complicated , 2As are one of , if not THE simplest engines to work on , as you have now seen , no awkward taper flywheels , keyed timing. Every 2A that I’ve done have always had a head gasket.
I can’t see from your pics , but did the rollpin actually go through the crankshaft , or just through the alloy starter and into the centre boss.

Andy.