Ran through the entire process on my son's 4th Gen iPod, and everything was great (comments were very helpful). But: I've got no audio. None - zilch - nada. The speaker wires did not rip, the volume button's flex cable did not tear... in fact, they work to raise and lower the (on-screen image of the) volume. But no sound. The impact that brought the iPod to Dad's operating room was near the headphone jack - but the sound worked even with the smashed screen. Now? Clean, crack-free screen but no sound. Any clues?
Turns out my "extra" part was the one that James Molyneux mentioned, which comes out as part of Step 5. (The clip provides a bit of extra ground contact between the back of the WiFi antenna and the rear case.) Again, totally awesome instructions - thanks!
AWESOME guide - very impressed. All works but I did wind up with an extra part so I must've improved upon Apple's design. The part is a small, rectangular grounding clip (black and gold) with a single brass finger and a hole through the black part... this is NOT the one mentioned in Step 26. Not sure from where it came off & not inclined to dig back into it - but would love to know where it was from. It's 1:30 am here and I may be overlooking something idiotic... any help would be much appreciated. Thanks again, Jim