What's he got to smile about?

I suppose he's happy because his eyes are self-centering with a pair of springs behind his eyeballs. No easy feat. The distance between the holes in the synchronizer (a piece of wood) have to be precisely measured and drilled. A little to the left or right, and the little fellow will look too wall-eyed, cross-eyed or just plain cockeyed. To be candid, it took me three tries before I got it right.

(There was much cussin').