Measuring the handle spline

A home owner from San Jose, CA says:
So to be sure a crank handle will fit my operator, how would I measure the spline? The spline is like a gear shape, so is it a diameter from peak to peak?
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Tom from SWISCO responded:
Thanks for posting!

Great question. In this case, it actually depends on the hardware manufacturer.

If you can upload a picture of your existing operator with the handle and then a picture of the handle removed, we should be able to get a better idea of what you could use as a replacement.
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