Jon McNeill

And so when I started at Tesla, we were having a super big problem producing Model Xs and getting that Falcon wing doors to fit.

And Elon and I had shared this favorite book, The Goal, which is all about manufacturing process.

And he grabbed me one day, he said, okay, The Goal guy, come on, we're going down to the line.

And I said, he said, help me solve this problem.

I've been sleeping in the factory trying to work on this.

And I said, okay, like, we're going to walk up the factory line to where all the inventory is stacked up on these doors, because that's the clue where the problem exists.

If throughput can't get through there, it's all stacking up.

That's where the problem exists.

So we're just going to stand here.

So we walked to that point, sure enough, bunch of doors stacked up.

And I said, I said, the thing my mentor said, I said, you're going to now use, and I'm going to now use the greatest analytical instrument in the world, our eyes.

And we're just going to sit here for an hour.

And this is going to drive you crazy, but we're just going to watch these people work.

And so we stood there and watched them work.

And you could all of a sudden see,

oh, these people can't see where the bolt goes because it's blind.

And so they're threading a bolt blind and they're missing the angle and therefore the door is going on crooked.

What do they need?

They need a jig.

After 10 minutes, you could see this.