Iron Man Shellhead
Somewhere I have a pic of me disassembling an M21 transmission and installing new synchros and bearings.
It looks a lot like this.
Fixed.
By the way, I don't have any clue where you'd find that episode w/Barney Fife sipping soda, there are a few on youtube. I vaguely recall the episode you described but The Andy Griffith show is waaaay before my time.
I saw it on MeTV or something a few years ago, and then searched for it online but have never found it. Those two characters played off each other so well.