Support pin
thingiverse
My girlfriend created a support pin drawing using Sketchup because I couldn't locate one with these specifications, and it looks decent despite some rough edges.
Download Model from thingiverse
With this file you will be able to print Support pin with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Support pin.