Undershelf 1/4 dowel holder

This is an undershelf bracket for a ¼ inch dowel. My need was to hold rolls of wicking but any small and fairly light weight roll should fit. Holes for a T20 #8 deck screw. I didn't bevel for the screw head. This is my first design in a long time so… is what it is. Open to feedback to help me design better. It might be over built. I printed in PLA and it works as intended.