Set up in the three jaw chuck. You might note that the con rod is slightly proud of the chuck, this is done to allow me to true the end of the con rod by tapping with my trusty "Ammer".
Keep turning the chuck by hand, use a tool close to the surface to check , then tap and check, tap and check.
Once the con rod is "trued" as closely as possible, the turning can begin.
Set the cross slide to follow the angle of the rough casting as closely as possible so that you get a nice taper.
You can also do this between centres, by offseting the tailstock the appopriate amount, but then you have to remember to re-center the tailstock when you have finished.
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