A crank is connected and after about eighteen million turns each one will lock down. Done this a few times in the sim many years ago practicing for hydraulic failure.
It happened for real to me three times, once I cranked it down when I was playing FE and the other two times the guy playing FE cranked it down while I looked from the left seat.
Oops, I take that back, one of the times we had a real FE on board and he cranked the gear down. Really didn't have to watch him, he knew what he was doing.
The crew in the video did an excellent job.
As for the non-use of the spoilers, for some reason I seem to remember Boeing recommending not to use the spoilers if landing nose gear up or showing unsafe/not down and locked. But I have not flown a 727 since 1998, so I very well could be wrong. I need to dig out my old training manuals and look that up.