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But for all the folks that make their indys looser by straight up just not running a washer or two, the thin 3/8 24 nuts are a good option

Damn, I didn't know those existed. Where did you find them?
I thought about the nuts that come with Shorty's 7/8" bolts, and I googled "thin 3/8 24 nuts" and there were a bunch of options. Might be at a local hardware store too
*** Edit - Adding this - I would be stoked to find some even lower profile nuts around, but after looking I just couldn't see or find any that were worth getting for the price and size.
Shortys deck bolt nuts are the jam nuts, or at least that is what they are called when I go to order some from nuts and bolts wholesalers.
The axle and kingpin nuts are also the same jam nuts too, so what we get now is the thinner ones. The other originals are actually twice as tall and totally not suitable for modern skateboards, even though the older skateboards or even some really cheap ones came with the taller / standard hardware on them back in the day.
That said, there has been a few companies that have put out ultra slim or low profile nuts which are definitely lower than some other ones, which I recall some people getting on here before too, maybe titanium, maybe not, but I seem to recall them being about $20 a set and quite difficult to get, as well as being super expensive.
Of course look into it and see if there are any other low profile nuts around, but it is much the same as deck bolts - there are the regular ones and the low profile ones, of which most people will use or see both, but when it comes to truck axles or kingpins, we only ever use the low profile ones as a common thing, as far as I am aware.
In saying that I have seen some others that are way thinner, but they don't have nyloc to keep the nuts on, so I guess you could use Loctite or something with them, but otherwise there just didn't seem to be a good simple solution that is widely available, when I had a good look for anything in the UNF 3/8" nut option.
Pic example of thinner ones with no nyloc:

This is a regular nut height, for all of them, the 3/8", 5/16" and 3/16" for comparison:
