Glass Window Retainers

The Problem
----------------
The retainers holding the glass in my bookcase door break easily. The manufacturer used cheap and flimsy plastic parts.

The Solution
------------------
Design and print a better part that re-uses the same screw holes as was manufactured. In the image with two parts, the white one is the original fragile part, the brown one is my reworked design.

The manufacturer of the bookcase used countersunk screws. The original plastic retainers had no countersink. Henc