Here are the Ali arbors I bought if you are looking for more data points. I tried one of each style for the 2 primary hole diameters, they are both well made. I suppose you could remove the blade with the tool still in machine for the bottom cap style vs not for the other, but its probably not a common machining op anyway. I bought a lookalike from another dealer (Azzkor), it was OK but not as nice as below. The runout on the arbor shank & saw surface was excellent, I suspect better than most saw holes but overall I'm happy with my Chinese purchases. Note the thread direction.
I bought my blades from same seller (Zhongyinc Store). Way more graduated diameter/thickness selection, but all metric of course. You can also find better quality HSS blades on Ali (with a flashlight & duck whistle) - but you may have to try different keywords like 'stainless saw'. Heck they sell carbide for similar prices as some HSS N-Am import/re-packagers. Once upon a time KBC carried eastern Europe saws but they slipped in some Indian soup can lids so I'm done with them.
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