Looks like a typical Honda Camber (sic) adjuster. They always seize onto the internal shaft, because Honda is too tight to lube them with Copper grease at the factory. I've a seized OSR on the S2000. We get round it by torturing the rubber bush, but I cannot dial in as much camber as I'd really like.
Now that's all steel/cast iron. Yours is a steel caster adjuster in an ally casting. Just add water and you've got electrolytic corrosion.
What I'd try is drowning the bugger in Plus Gas almost daily for a couple of weeks before the next alignment. With luck, it may soak in and you can break the corrosion with a club hammer. Good luck - it can cost £3,000 in new lower wishbones on an S2000, if they are all seized!
Nick
“I find myself irresistibly attracted to cars that nobody else buys. The NSX is a classic of the genre because nobody buys it and yet it’s a fantastic car. It’s got a wonderful compactness and simplicity and unpretentiousness to it. Honda rudely continues to make them whether we like it or not, even though there can be no commercial logic in doing so — I thoroughly admire that.” Rowan Atkinson