The barrel fits into the body from the external lower edge of the bass, which should leave a small amount of the thread poking through on the inside to fit the nut and washer. I know some people have found that there isn't much of the barrel poking out, and have had to cut away some wood inside the control cavity to get enough barrel poking out to fit the nut on. I don't know if this is the case with you. The internal end's hidden under the control plate, so any wood removal doesn't need to be the neatest of jobs if your woodworking skills aren't that great.
If you still have doubts, it's best to post some pictures of the holes and any parts you have issues with.
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