Stanadyne has a tool for it and it costs $80 if you buy in the right place and $200 if you buy in the wrong place.
As I recall, and it has been a while, it can be done on a sheet of paper with a 360 degree wheel drawn on it. Here is the plate with a timing mark from a three-cylinder John Deere. The mark is set at 184 degrees. That is the distance, in degrees from the factory reference mark "1L." Your plate will also have a reference mark but it might be some other letter/number combo.
I laid down two pens showing approx where the 48.5 degree mark (from either direction) for a 2010 ought to be IF my memory is correct. See if you have a mark that comes close.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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