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Since the clip is springy, you only have to get "close" with your measurement. If you use a thin bit of wood -- like a flat toothpick -- and place it in the bottom of the groove, then mark the depth with a sharp knife (not a pencil or pen), you can then measure that with your calipers. Double the depth and subtract from the diameter, and you'll have your target e-clip minor diameter.
Probably a dozen other ways to measure it, too, depending on what you have to work with.
You can buy assortments of e-clips at places like Harbor Freight. They also sell calipers with knife-edge jaws that should get down in the groove.
Chip
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