Don’t use a frozen ninja, you’ll lose alot in all the nooks and crannies. Instead find a cheap spice grinder, the blades are dull & this is key to breaking it up evenly and not introduce heat.
As @cyclopath says
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burr grinder ? have a link ?
Unheated t-shirt press,
I would say a bullet grinder with a flat blade
or maybe use a hydraulic press with a stainless square container at the bottom that’s bigger than the brick on the press for easy removal.
Go down just enough until you hear a crack
Think something like this on the cheap, low throughput side:
And something like this for the more expensive, high-throughput end:
Burr grinder are bladeless mills that have a custom set granular size of the output material, but if someone wants to do it manually, I highly suggest a good metate.
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At such scale, I would rather advise ball grinding.
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US $193.50 14%OFF | XEOLEO Grains grinder Electric Grain Grinder Mill Grinding powder machine Stainless steel 750g medicine flour powder crusher
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Pretty sure that type of mill uses blades, and with the hardness of isolated THCa, I can imagine they wouldn’t last long. I’ve done a lot of salt milling with bladed grinders and destroyed the blades real quick.
Both @Dr_Jebril and I have proposed bladeless options for milling, and I think that with OP already having seen ware on a bladed grinder, they are seeking an alternative solution that will also create a uniform grain size.
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Can you right up an sop?
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Yeah!
Dry ice and a vacuum sealed bag and a concrete wall or floor are needed.
You put your diamonds in the vacuum sealed bag.
Put that vacuum sealed bag with your diamonds on the dry ice for 4 hours.
Throw your vacuum bag that’s at subzero temps that contain your diamonds against the concrete.
Cut and pour your crushed powder and enjoy.
You could also just embrittle them with dry ice and shake them in a large vacuum seal bag.
Might have larger chunks at the bottom but I’m almost sure you can just put them in a vacuum sealed freezer bag on dry ice, take the bag off dry ice and then shake like crazy and you’ll end up with powder.
…
Anyone try this
Edit:don’t do this
Such method is not convenient at all.
Doing so, one quickly gets holes in the frozen plastic bag, material spilling out and small plastic pieces mixing with it. 
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Was ½ serious with that tek
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Sounds like you need a conical mill.
Yea I was under the impression the bag tek was a joke this entire time.
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