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Does this mean you do all your redrawn engines with 24mm bores? The original Munchaster engine is 8" long with 4" flywheels and 1" bore. Maybe you have mounted the crank in a different position on the base plate on your model as on the original the flywheels end level with the end of the curve on the base plate Jo
All the ones I have done with a 24mm bore - Jowitt, Muncaster, Thompstone, CHUKY and this Oscillator. There are a few more part drawn up that will also have the same bore