There is a more precise method, but in practice it's just like the gasket method. Each gasket is made with some "slop" in the bolt holes. If you make a template that removes that slop, you can scribe a very accurate line on each side. I made one for a 124 motor a while back on our laser. It took a try or two to get it right and would have been much easier with a set of drawings. Another way to eliminate the slop is to use shoulder bolts. Past that, you're looking at big cnc machining bucks.
Dave951M
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