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It works http://www.youtube.com/watch?v=6xIffSPzvuII couldn't resist trying it out with compressed air last night, I'm very pleased that the engine ran straight away. However, it's not finished yet, the slide valve, particularly the timing need adjustment and the bearings at the top of the connecting rod are too slack hence knocking. Strange because the bearings were ok when it was driven by an electric motor. The governor hasn't been refitted because it gets in the way when making adjustments to the eccentric / valve timing. At the moment the piston is certainly double acting but the exhaust only chuffs at one end of the stroke.Exasperation with the Parallel Motion is an understatement Dave, I tried to keep mine in 'one lump' as much as possible but those pesky little split bearings kept escaping.Andy