Drop-in T-Nut for 2020 aluminum extrusion. You do not have to disassemble anything to install these. Simply turn it 90 degrees so it slides inside the channel. Then turn it 90 degress to the right (clockwise) and it locks into the slot allowing you to screw into it to mount accessories.
This design has an oversized hole for an M3 brass threaded insert to be installed with a soldering iron to heat it up or you can use a purpose made heated install tool.
Amazon link for the brass M3 threaded inserts I used:
https://www.amazon.com/gp/product/B09TNK8GD6/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1
The author marked this model as their own original creation.