Palatino bass missing a part?

A friend bought a used Palatino electric upright bass, and I'm helping them set it up.

Check out the attached pic. Is the tailpiece assembly missing a piece that would lock the tailpiece to the body? The metal L piece on the very top doesn't seem strong enough or well positioned enough to support the eventual tension on the strings (the strings are super loose right now). There are two holes that make me think maybe there's another piece that gets screwed in there to hold the tailpiece in place. Any help here?

Thanks!

Palatino_tailpiece by wrees posted Nov 27, 2018 at 10:18 PM