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Hi Andrew.Well recognised! This is indeed the same engine featured in Stationary Engine some years ago. The points system on my engine is a simple brass strip that pivots on a block of insulating material to isolate it from the engine. The pivot pin is a steel bolt countersunk into the back of the block to avoid shorting against the body of the engine.The brass strip is held in position by a knurled nut. The other contact is simply a bolt through the gearwheel. The contact area of the brass strip is twisted slightly so that the end of the bolt brushes it as the gear rotates, rather than hitting the edge of the strip.Timing is adjusted simply by pivoting the brass strip up or down as required. All rather crude but effective. Unfortunately, I don't have any sharper photos than this at the moment but I hope that helps. Ignition is by battery and trembler coil.