Dave writes:

<<<<<
        To sum this up, it looks like the head needs to come off because no
matter what I try, a bunch of stuff is going to make its way into the
cylinder... Also, the threads do not appear to be crossthreaded (it broke
about 2 or 3 threads down into the hole and the exposed threads look ok).
The center electrode came out with the body of the plug so I really only
have the threads and the three prongs left.

dave
>>>>>

Say Dave, just curious.  What crappy brand of spark plug was this so I can
steer clear of them??

Good luck with your project.  Everything is a learning experience after all
and thus well worth the time you put into it.  Let us know how it comes out.

Regards,

Carl Turner