When I first got my '95 Crown Vic the spotlight didn't move at all.
WD-40 seems to have solved a lot, though.
The two basic motions seem to be that you can kind of push the handle
up and down to rotate the shaft itself. Or, you can twist the handle,
and there's a cogwheel mechanism inside that twists the light. It's
this latter motion that doesn't seem to work too well.
The twisting the handle so the light points forward seems to work
well, but twisting the other way to return it to not pointing forward
often stops moving the light before it's come all the way back; the
remaining twisting of the handle has no useful effect.
The cogs on the hand-grip part of the light, that you can easily
inspect by just unscrewing the handle, look a bit damaged.
Is this not-fully-returning an expected, well-known problem? Is it
easily fixed? If it's likely to just be a case of getting a new handle
part then, heck, that's easy to replace. The next step, with the other
cog but still inside, looks like it would come off fairly easily too,
but then I'd have to move the wire onto a new switch. It doesn't help
that, not having used such a spotlight new, I'm not sure what to
expect from them, but it sure does seem useful for when you take the
dog for a midnight run in a field somewhere. (-: