That's what I feared. I am a little in doubt though, as I seem to remember when putting it together, that there were dowel pins holding it together. I am a little uncertain as to how many dowel pins are actually in the crank cases. The holes in the crank cases I noticed are in the front and in the back (circled in the picture), and I assume it's part 16 (also circled) that are going in the holes. But are these the only dowels holding the crank cases aligned?