Hi, I've recently started building my nybble but I'm stuck on trying to get the servos to push in completely when assembling the body. The belly doesn't seem to go in far enough for the servos to lock it in, and no matter how hard I push I can't get it in. This causes the belly to stick out on the other end for the back piece, therefore not being able to fit it on. In addition, the battery holder had a divider in the middle of the holes so I wasn't able to put the rivet in the specified holes, so I just shifted it down a hole. Please let me know of any mistakes.