Once the above information is in hand, it's possible to nail down precisely what the spline is. A better and more definitive way is to use 3 measuring wires and then use a large gauge pin in the center (assuming there are a set of plug gauges available in the diameter range required). If the spline has an odd number of teeth, it's also possible (and valid) to measure between 2 wires (which would sit ½ tooth off from 180°). If the spline has an even number of teeth, it's possible to measure between 2 wires using a telescope gauge. Use 2 or 3 different diameter of measuring wires that all rest on the profile of the teeth, and take a measurement between those different wires. Measure the major diameter (largest diameter across the tips of the "space") On an unknown internal spline (where the male/shaft that fits it is not available), the typical route would be.
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