Talkbox tube adapter for compression driver 18TPI thread to plastic PF19 cable gland

I used the threads from https://www.thingiverse.com/thing:6980217

The nut for PG19 is only slightly bigger than the ID of the threads so I cut a tiny bit of the threads at the corners of the nut. Pushing it in past the threads takes a little patience: it will get stuck if one side gets pushed in more than the others but is easy to back out when this happens. Once it's in it stays captured unless pushed out which is a nice feature.