412: Piece of wood.
413: Pipe wrench / grip / lifting tool / etc.
414: Binder clips, rubber bands and a laser light...
415: Torture device?
416: "spring" from a "don't open too far" door device / door stop.
417: Corner line scribe (non-techical name?)
I've been trying to post one non-tool photo each week, but it's getting
harder and harder to find something good for each set. I've got enough
tools to last a little while but I have to scrounge every week for a decent
close-up or other non-hardware pieces.
I've never used one and was going by what the seller told me. I did some
searching after seeing your post and found a site where they sell internal
and external bending springs, not sure when it would be appropriate to use
one instead of the other.
As you stated, mine looks like an external one.
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