The slide-in T-nut with ball spring is a fastening option that loads from the profile ends. The ball spring holds the T-nut in the T-slot, even when the profile is in a vertical position. It is available with different thread options.
For technical details and images, please search for the product using the 80/20 interactive catalogue found here: https://catalogs.8020.net/80-20-Catalog-26/C/.