how do i remove doubles for future reference?
and, no. this wasn't a result of me filling in the circle even after the tutorial told me not to. its hard to explain but I extruded the circle, deselected it, selected both edges using an odd method, and extruded it again; so I had 2 extrusions coming from the same place. I ended up just modeling the launchpad with a cylinder. I could just look it up but I'm also curious to see how questions get answered on this site. (: