Ray - I'll contact you off list regarding the reverser. What lube do you use? The drive train - at least the part you see from the bottom of the truck - is all plastic. I don't know whether that affects choice of lube. As an old (in both senses of the word) Flyer guy, I'm used to metal on metal...
The reason I said ignore all the other screws in the bottom comes from the same experience you had - namely I removed all the screws!
- Rich