A couple thoughts looking at these picture. A self tapping screw for plastics is needed, hopefully that is what they used or supplied. the old broken piece...you see how the hole made with the screw isn't centered in the part while in the new part the hole meant for the screw is clearly centered? It means it was forced...HARD. The design here could have been better. The edge of the hole, they should have chamfered it so that the screw will "self center" which should lead to a minimal amount of material displaced/deformed/cut whatever....and thus more sturdy.