I know thebluepotato had an issue with his purple aluminum HKS gears. Something about the face wearing where the bolts clamped down. Search the forums and you'll see some chatter about peoples concerns with them a few years ago. I'm not even sure HKS make these anymore given what happened to them and given how old the Miata is. You'll be looking for NOS or used. Beware many retailers supposedly offer them but don't really have them in stock.
Really, Toda are the best on the market and there is no need to buy others given the consequences of a part malfunction (see recent post about near catastrophe due to a cracked Fidanza). You apply a thin film of grease to the inner plate so it rotates smoothly when you loosen the bolts for adjustment. They work and look good and will last a long time without a problem. All that JDM engineering and quality does come at a price but how much does a new motor cost or even a simple tow bill?
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Originally Posted by BlitzWing
