This is a toy screw I modeled after the ones found in the VTech Drill and Learn Toolbox. The set only comes with two screws and no replacements are for sale. When we lost one of them I decided to model a replacement.

Notes

The screw doesn't stop with the clean solid stop of the original. I believe the threading needs to be played with a bit to get this correct. I've decided to stop at this design as it doesn't cause an issue of tightening too far for us.