A potential plan, part 2

<Tick>
 
"Let's see, I've got the keycard, the firing mechanism from a HGD-324 gauss carbine," Cerebrum muttered examining a crumpled piece of paper. "Now what?"
 
"What's that?" Rufus asked, curiousity overcoming his revulsion of Cerebrum.
 
"A list of items to modify my meson cannon into a five-dimensional chronoton meson cannon that should give us a way out of this mess that you caused."
 
"And where'd you get this list?" Rufus asked.
 
"I got it six months ago," Cerebrum said, putting the list into the photocopiter that they were standing in front of, and making a copy of it.
 
<Tick>
 
And they were back in his office, about six months earlier. "Ah, Dr Cerebrum, good to meet you," Cerebrum said.
 
"Let me guess, some idiot's messing around with a time machine again," Cerebrum replied, unplussed. He'd seen stranger things. Usually when he he had forgotten to take his pills.
 
"Yup, here take this," Cerebrum said, handing over the photocopy of the list. "You'll need it in six months."
 
"Thank you, Dr Cerebrum."
 
"You are welcome, Dr Cerebrum."
 
<tick>
 
"Wait a minute," Rufus said, as the pair appeared in the middle of the Sahara desert. "If you gave yourself the list, by making a photocopy of the list you were given, then who wrote the original list?"
 
"If you try to figure out time travel, you'll go insane. And believe me, I know insane."
 
"Yes, you would, wouldn't you?" Rufus muttered, then got whacked upside the head. "No insulting your psychiatrist. I'm trying to save the time-line here from your idiot interferance, a little respect would be nice."
 
<tick>
 
"Ah, Cain, nice to see you. This is Rufus, the idiot who screwed up the space-time continum," Cerebrum said, appearing in front of Cain. He then reached forward, produced a hammer and smashed the screen. He reached inside and grabbed a chip. "Video control chip, check," he muttered, checking it off on his list.