Failed to Substract from revolved body

I’d like to create a phase to a thread (Revolved body).
To get there, I create a dummy body and substract it from the thread - most of the time it fails.
Download example file: Failed Substract Example.shapr

That is weird. But you can subtract the head before adding the thread.

The body you want to subtract has a circular cavity that is a profile of your thread. I removed that cavity and now it can be subtracted from the revolved body. I assume this what you wanted to do.

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Thanks a lot!