spark plug boot issues

[oderus1671]

first post here, been lurking for a few weeks.
So we got this 05 gz250 for free from the misses dad, with only 500 miles on it, for free! So I am currently trying to de-muck up the carb from sitting a few years, and just for grits and shiggles I took the plug out to check it. I noticed when it came out the tip was a threaded end. Not used to seeing this... I look in the boot and see a threaded brass part in there. I figured it had come loose off the plug, so I pull it out and a spring, a tiny metal disk, a rod of unknown material, and the threaded insert flys out. Does anyone know how these go back in and in what order?? Ive never seen anything like it before!!! Thanks yall!