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Dave,OK, so you are going for the bore and stroke dimensions you prefer rather than an exact 1/3 scale.What CAD package do you use? With AutoCAD there is a neat way to import a bit map image, stretch the image to the required size, you can then trace/ draw over the image to produce accurate CAD drawings to your chosen size. Saves a lot of ruler and divider work.Tell me more about 3D printing in aluminium.Mike