I have one you can borrow but it is a little finicky. Everyone in a while it free spins and nothing goes through. Can be a real pain in the ass. That said, it is better than nothing.
That doesn't sound good. I ran into the issue you describe after about 70 batches. The roller that is no attached to the drill ( the other roller) doesn't spin. I had to take the BC apart, clean is well, put some olive oil in the ends, reassemble. It's been working fine since. I am a bit more careful when I clean it. I take a brush to the BC and do my best to clean any dust. I make sure the other roller rolls well.
A couple of Questions: do you condition your grain before crushing? Do you lightly spray your grain before crushing? That could gunk it up.
You probably should take a minute and brush your mill before crushing.