I got the anchor from: https://www.thingiverse.com/thing:2177943
I used a 5/16-18 hex nut, a 5/16-18x 1-1/4 eye bolt, a 5/16 wing nut and a washer
I break these couple times. play with the mesh a little to get a stronger design.
Bed_Rail_Insert.stl | 280.2KB | |
Part2_v2.0.STL | 184.5KB |