Ok. Trying a new thing today. Just got my new inserts for making agrocrete mounts with a threaded port on the bottom. I've never made agrocrete, so I imagine this will turn out badly the first time.
The 3D printed part has external threads to drive into the cement, then internal threads for the Coralok adapters. The idea here is that you will be able to attach the Rock Anchor or Sand Anchor, or any future "posts" to a more traditional, natural looking mount.
And here's a terrible phone picture of the process. The white insert is about the size of a blueberry.
Just started, so I'll check to see how they've set up in a day or 2.