That's what XCOR's Doug Jones calls himself... "rocket plumber", that is, not "security leak". (XCOR is actually a bit secretive about the details of their hardware... I've seen the engine installation on EZ-rocket up close - nice! - but Doug insisted on stuffing rags up inside the nozzles before he'd let us look at the beast: he didn't want anyone to see just how they had done the injectors...)
-dave w