"Help! I took my pocketknife apart and broke it!": How to fix things when a disassembly goes wrong

Today, I'll give some advice on the 'next steps' when you've taken apart a pocketknife for routine maintenance, and things just aren't going back together right. Maybe the centering is now off, or the action's now gritty, or everything's just out of whack. Either way, we'll talk about common sources of problems, and good steps to take to fix them.