2 hours ago, jedovaty said:@JoNorvelleWalker and @Tri2Cook thanks. I couldn't find my blade grinder, and was looking to do a very small quantity, so seems like this would be a bad way to go. I rarely do spice grinds, so was looking to use something I already had in the house (way too lazy to use the m&p). Ended up borrowing a relative's blade grinder. They work all right sifting.
Very bad way for a small quantity of anything. But the only method I have found of making truly smooth nut butters.
Edit: @nathanm says you can use a colloid mill.