So I took the left saddle bag frame off to access something underneath.

I put it back on, pushed and turned the fastener and it felt like it locked in place. Went for a ride and found it had come loose and the frame was hanging on by the other two fasteners.

Tightened it again, and it came loose again.

These are unique fasteners in that they are quarter turn type, not threaded.

Anyone have any experience with this?

Thanks!