Spool Holder Locking Clamp

This is a spool holder locking clamp for M8 threaded rod. I use threaded rod as the spool holder axle. The clamp keeps the bearing in place (see my double bearing spool holder https://www.thingiverse.com/thing:2468356). The problem with the original clamp, even though it's threaded, is that it would sometimes loosen. This new clamp is not only threaded, but it also incorporates a small lever clamp that will squeeze the threaded rod. Note that the threads are clipped to make it easier to s