Unscrew original feet, attach 2-4 of these with countersunk M3x12mm screws. Can be rotated to different orientations depending on desired position. Screw onto rig using the same number of M6 bolts and T-nuts.
Note: provided STL is a bit longer than the feet in the photo for better adjustability and to make it easier to screw in the M6 bolts.
Fits well mounted sideways on the 160x40 bottom rail (pictured)
The author marked this model as their own original creation.