Same as https://www.thingiverse.com/thing:3043116 but with the addition of a skull. Print with the skull side up, and use supports. See the above link if you want a solidworks file to edit for your own purposes.

I advise to print this in either ABS or PETG. My first PLA bugger tube plug (without skull) snapped off at the pin hole. The marker was still functional, but it was annoying.