i just bought this exact throttle for my cb500t. here's what i found...
-the stock cable adjuster's threads are too large to fit the hole of the aftermarket throttle
-when demel-ed out the cheesy potmetal fell to pieces
-it cracked in half when tightening it to the bar, and the only reason i tightened it as much as i did was because it was still moving/spinning with the plastic tube
the first two points could have been delt with by putting a different upper throttle cable in. but there's no getting around how terrible the quality is in reference to the metal itself. get what you pay for, and a $20 throttle gets you nowhere.