It's not hardly a simple screw. Its machined with a shoulder and a slot, and its chrome plated. They last forever, so not many get sold.
FYI: It is the same adjuster that came on the 305 Super Hawk and many other bikes. But the same comments apply. They are not an easy piece to manufacture, and other than losing one, Honda never expected any one to buy a replacement. So the price is reasonable IMO.
But everyone is entitled to their opinion. Not picking on you, though it may sound that way. Just saying...
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As an engineering student i should appreciate it a lot more then just a screw. In the process of tearing my bike down i lost mine, you can pick on me all you want haha