* Add 1 Part 3706 Black Technic, Axle 6 (Extra)
* Change {2 to 4} Part Light Bluish Gray 4274 Technic, Pin 1/2 (Extra)
* Change {2 to 3} Part Dark Bluish Gray 32002 Technic, Pin 3/4 (Extra)
The primary model uses 7 6L axles and secondary model uses less. So the 8th
is an extra. Both models use 2 LBG Halfpins, so the other 4 are all extras.
The primary model uses 4 DBG 3/4pins and the secondary uses only 2. So the
other 3 are all extras.