The bow on the original model was just slightly too long. It should rest on the teeth of the plate in order to grip the fabric.
I did not make any changes to the toothed plate.
Assemble with 3mm x 8 or 10mm screws. I did need to ream out the holes in the toothed plate just a tiny bit.
Printed on Ender 3Pro in PLA. PrusaSlicer settings: .2 layers, 20% infill, 5 top and bottom layers, 4 perimeters.
The author remixed this model.
Resized the “bow” piece to make the legs 1.5mm shorter. This allows the buckle to better grip the sock fabric and not slip when the weights are hung.