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Thank you for your interest and support Zyphyrin, I think that Dave (Steamer) did some very fine milling with a conventional machine at work using a barely visible cutter but I can't find the thread at the moment.The trials with the diesel and the two cylinder engine have highlighted several problems that I will try and work through on here.- The first one is the inlet port on the separate element pump. If the cone on the tapping drill goes to deep it will destroy the O ring seal. I have ordered some 4.5mm endmills to try rather than a drill which should reduce that risk.- The delivery valve seating builds up some scale when hardening the pump element. I lap out the bore and will have to try the same with the seat. A piece of 4mm brass rod should work.- The dynamic forces on the injection pump plunger are quite high. The ball race cam followers on the diesel broke, the bronze follower has spread, I think solid hardened steel is the next phase. The stroke adjuster on the two cylinder engine is also affected.Lots to do and think about