It's easy for Han to say 'okay, now let's put it all back together.' He's done all of this before. It's not quite as straight forward for someone who isn't as familiar with the procedure. Hell, the tech doesn't even exist where Josh comes from. So the kid gets a pass and Captain Solo gets a reminder that his teaching isn't finished.

No big deal. It ain't as if they're in a rush.

"The contact breaker." He gently points out. "We're making sure that's fastened tightly. With the clasps first and then the screws. Then we're fitting the housing we took off with a few bolts."

That's not all of the steps, but that's the next couple. It's going to end, of course, with Han holding up the fucking engine while Washington secures it as fast as possible. That part is gonna be fun.