Tablecloth clamp for a 13mm, 18mm ,21mm & 25mm thick table

This tablecloth clamp is designed to clamp a tablecloth !
So this clamp is designed with a ribled top side and a spring shaped bottom to secure it at the bottom with a force. Printed & tested this weekend in the rain and a low force storm on a thin PVC cloth (as in the pictures)
Dimensions:
13mm; 18mm & 25mm high, 25mm wide, 38mm long (or 35 for the thinner one)
I used 18mm & 25mm thick as basic dimensions, feel free to ask other thickness or lengths. The native design file is soli