Originally Posted by
ironyusa
Threads are dirt cheap as long as they're a standard profile and pitch so they can be cut with common tools. Personally, I'd trust threads with a permanent thread locker over a slip fit. Depending on how your threads are done, you can stake it and they won't come loose under a reasonable use case. Assuming this is for the paragon plunger, I think you'll be fine with threads and some locker (though uninformed users will inevitably try to take it apart).
The m2 bolt is multiple pieces, BTW. We haven't has a single report of one separating. It's threads and locker.