The robot chassis base plate is on a 50 mm standoff to utilize the mounting holes for a servo instead of getting a second multi-purpose bracket. Saw this on a YouTube vid. Follow the "0.1 assembly guide" that comes with the kit (and is the only one produced) as far as you can get without fastening things much, then take a look here if you need. I had to google pretty hard to find some pictures and a short video snippet, but it's out there. The kit also does not come with enough screws to mount it this way. You are supposed to get an extra MP-bracket, they come with the screws too.
HERE is the images I can find. The ones you can see on this page are my own.
|These are not mentioned in the assembly instructions|
and many people seek help for this kit, but it's supposedly
agreed on that this is how you do it.
|Then, on the multi+bracket, put them in like this.|
This will fit quite nicely. Not so much with the U-bracket.
|Make sure you don't fasten the center screw until the|
servo is centered. Then you can take it off, and re-position it.
Here you can also see the positions for mounting
the Arduino base plate (here with Mega ADK and breadboard)
|Make sure then, that you can twist it as much as you want in each direction|
|Try it out. When assembling, keep using two screws to|
test out that you can rotate (slowly!) the servos
The standard servos goes up to about 150 degrees
from the data sheet, but mine almost does 170 or so it seems.
|Then fasten center screw|
|Two 9V batteries, supposed to be taped in here|
on opposite side of the breadboard to counter weight.
The 6xAA battery pack also helps putting
center of weight down a bit.