Split spacer shim for 20x20

This is a possible way to capture the shim in the t-slot by making it spring fit. I have not printed it to see if it works. It is just the original model split and one half rotated 5 degrees and joined again with the T end flattened. Maybe the split is still too shallow for spring action. I would have to print one to try it, but I don’t have any extrusions to test fit.