Odd that it didn't work out for you guys. Remember you don't grind them or anything, just into the freezer and then into the screen chamber of your grinder. Not where you put the cannabis to be ground up, but where it falls onto the screen after it has been ground.
As to why it won't work I have no idea. Same as to what you are skeptical about, not like I'm making any kind of sales pitch or anything lol. Maybe I should reiterate that I am using the stems from the buds themselves. As in the ones you pick out as you are breaking them up to be ground. Not using the actual stalks/branches from the plant. Only whatever is left after I manicure my buds.