hose clamp seems to be the best method for OC. never used it on other stuff really but theres nothing else better in my opinion for OC. turns it into dust and they are super cheap to buy, plus you can find them all over in your garage or some shit.
^Its considered an effective method for crushing pills, odd as it sounds. I myself have a bit of trouble finding OC, but when it comes to pills and powders, I put them on a table and karate chop them down, or yell insults at them till they "break down" lol.
All joking aside, I use a small stone mortar and pestle to crush substances.
All joking aside, I use a small stone mortar and pestle to crush substances.