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Incidentally - I sold those first two little vee oscillators still in their twin set up at the last aeromodelling swap-meet held at Watford here in the UK. That would be quite some time ago now but some time back, maybe two three years or so, Jo kindly posted some pics of engines she had taken at a model show. I was absolutely convinced that one of them was one 'side' of my twin set up but try as I might I can't find that pic again.