In article ,
R.H. wrote:
This week's set has been posted:

http://puzzlephotos.blogspot.com/

418: Centering point.

419: "Do not look into laser with remaining eye"

420: Reaming head

421: World's most difficult to use hole punch

422: A local US highway, not fun to commute on. Or perhaps a Chinese
navigation tool (I'm guessing the center part is a compass, the others
are used for measuring the sun angle)

423: Dunno, maybe horse-related?
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There's no such thing as a free lunch, but certain accounting practices can
result in a fully-depreciated one.