These are mounts that screw directly into the top of the Neptune 3 Pro (plus/max I assume). I used 30mm socket head screws.

This allows for you to use the modified files from Mlee on the mount.

I didn't think it would be strong enough to add channels to the front and back of the mount so instead I added a hole. You can use a threaded insert or just screw into it.

Thanks to TheFeralEngineer for helping with the idea.